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思想02運(yùn)用數(shù)形結(jié)合的思想方法解題目錄01研究函數(shù)的零點(diǎn)、方程的根、圖象的交點(diǎn) 102解不等式、求參數(shù)范圍、最值問(wèn)題 603解決以幾何圖形為背景的代數(shù)問(wèn)題 904解決數(shù)學(xué)文化、情境問(wèn)題 1301研究函數(shù)的零點(diǎn)、方程的根、圖象的交點(diǎn)1.(2024·云南·高三校聯(lián)考階段練習(xí))關(guān)于函數(shù)SKIPIF1<0,則下列說(shuō)法正確的是(
)A.函數(shù)在SKIPIF1<0上單調(diào)遞減B.當(dāng)SKIPIF1<0時(shí),函數(shù)SKIPIF1<0在SKIPIF1<0上恒成立C.當(dāng)SKIPIF1<0或SKIPIF1<0時(shí),函數(shù)SKIPIF1<0有2個(gè)零點(diǎn)D.當(dāng)SKIPIF1<0時(shí),函數(shù)SKIPIF1<0有3個(gè)零點(diǎn),記為SKIPIF1<0,則SKIPIF1<0【答案】D【解析】對(duì)于A,因?yàn)楹瘮?shù)SKIPIF1<0,令SKIPIF1<0,則SKIPIF1<0;當(dāng)SKIPIF1<0或SKIPIF1<0時(shí),SKIPIF1<0,此時(shí)函數(shù)SKIPIF1<0單調(diào)遞增,當(dāng)SKIPIF1<0時(shí),SKIPIF1<0;此時(shí)函數(shù)SKIPIF1<0單調(diào)遞減,作出函數(shù)SKIPIF1<0的大致圖象如圖,故A錯(cuò);對(duì)于B,由A選項(xiàng)可知,易知SKIPIF1<0,又易知SKIPIF1<0時(shí),函數(shù)SKIPIF1<0單調(diào)遞減,SKIPIF1<0時(shí),函數(shù)SKIPIF1<0單調(diào)遞增;當(dāng)SKIPIF1<0時(shí),若SKIPIF1<0,SKIPIF1<0不一定成立,例如當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,所以當(dāng)SKIPIF1<0,SKIPIF1<0不一定成立,故B錯(cuò);對(duì)于C,方程SKIPIF1<0的根即為SKIPIF1<0與函數(shù)SKIPIF1<0的交點(diǎn)橫坐標(biāo),由A可知,函數(shù)SKIPIF1<0在SKIPIF1<0時(shí)取得極大值1,在SKIPIF1<0時(shí)取得極小值SKIPIF1<0;作出函數(shù)SKIPIF1<0的圖象如圖,當(dāng)SKIPIF1<0或SKIPIF1<0時(shí),函數(shù)SKIPIF1<0有1個(gè)零點(diǎn),故C錯(cuò);對(duì)于D,函數(shù)SKIPIF1<0有3個(gè)零點(diǎn),則可得SKIPIF1<0,且SKIPIF1<0;記SKIPIF1<0,令SKIPIF1<0,則SKIPIF1<0,所以SKIPIF1<0,于是SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0,故選:D.2.(2024·四川南充·統(tǒng)考一模)已知函數(shù)SKIPIF1<0(SKIPIF1<0)有兩個(gè)不同的零點(diǎn)SKIPIF1<0,SKIPIF1<0(SKIPIF1<0),下列關(guān)于SKIPIF1<0,SKIPIF1<0的說(shuō)法正確的有(
)個(gè)①SKIPIF1<0
②SKIPIF1<0
③SKIPIF1<0
④SKIPIF1<0A.1 B.2 C.3 D.4【答案】D【解析】由函數(shù)SKIPIF1<0有兩個(gè)不同零點(diǎn)SKIPIF1<0,轉(zhuǎn)化為SKIPIF1<0有兩個(gè)交點(diǎn)SKIPIF1<0,構(gòu)造函數(shù)SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0,故SKIPIF1<0,所以SKIPIF1<0在SKIPIF1<0單調(diào)遞增,而SKIPIF1<0,可得SKIPIF1<0圖象如圖所示故SKIPIF1<0在SKIPIF1<0單調(diào)遞減,在SKIPIF1<0單調(diào)遞增,所以SKIPIF1<0,對(duì)于①,SKIPIF1<0,所以SKIPIF1<0,所以SKIPIF1<0,故①正確;對(duì)于②,由①可知SKIPIF1<0,故SKIPIF1<0,因此SKIPIF1<0,故②正確;對(duì)于③,因?yàn)镾KIPIF1<0,所以SKIPIF1<0,故SKIPIF1<0,所以SKIPIF1<0,則SKIPIF1<0,構(gòu)造函數(shù)SKIPIF1<0,則SKIPIF1<0,而SKIPIF1<0,所以SKIPIF1<0,所以SKIPIF1<0,因?yàn)镾KIPIF1<0,所以SKIPIF1<0,令SKIPIF1<0,構(gòu)造SKIPIF1<0,顯然SKIPIF1<0單調(diào)遞增,且SKIPIF1<0,所以SKIPIF1<0所以SKIPIF1<0,故③正確;對(duì)于④,由①可知,SKIPIF1<0,所以SKIPIF1<0,令SKIPIF1<0,SKIPIF1<0,顯然SKIPIF1<0單調(diào)遞增,且SKIPIF1<0,所以SKIPIF1<0,故④正確.故選:D3.(2024·內(nèi)蒙古錫林郭勒盟·高三統(tǒng)考期末)若過(guò)點(diǎn)SKIPIF1<0可以作三條直線與曲線SKIPIF1<0相切,則SKIPIF1<0的取值范圍是(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】D【解析】由SKIPIF1<0,得SKIPIF1<0,設(shè)切點(diǎn)為SKIPIF1<0,SKIPIF1<0,過(guò)切點(diǎn)的切線方程為SKIPIF1<0,代入點(diǎn)SKIPIF1<0坐標(biāo)化簡(jiǎn)為SKIPIF1<0,即這個(gè)方程有三個(gè)不等式實(shí)根,令SKIPIF1<0,求導(dǎo)得到SKIPIF1<0,由SKIPIF1<0,得SKIPIF1<0,由SKIPIF1<0,得SKIPIF1<0,或SKIPIF1<0,故函數(shù)SKIPIF1<0上單調(diào)遞減,在SKIPIF1<0上單調(diào)遞增,在SKIPIF1<0上單調(diào)遞減,故得SKIPIF1<0,結(jié)合SKIPIF1<0,SKIPIF1<0,當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,SKIPIF1<0時(shí),SKIPIF1<0,得SKIPIF1<0,故選:D.4.(2024·廣東深圳·高三深圳外國(guó)語(yǔ)學(xué)校校聯(lián)考期末)已知函數(shù)SKIPIF1<0關(guān)于SKIPIF1<0的方程SKIPIF1<0有且僅有4個(gè)不同的實(shí)數(shù)根,則實(shí)數(shù)SKIPIF1<0的取值范圍是(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】A【解析】當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,當(dāng)SKIPIF1<0時(shí)SKIPIF1<0,當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,所以SKIPIF1<0在SKIPIF1<0單調(diào)遞減,在SKIPIF1<0單調(diào)遞增.當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,所以SKIPIF1<0在SKIPIF1<0單調(diào)遞減,在SKIPIF1<0單調(diào)遞增,SKIPIF1<0.畫(huà)出函數(shù)SKIPIF1<0的圖象,如下圖所示,可得函數(shù)最小值為SKIPIF1<0有四個(gè)不同的實(shí)數(shù)根,數(shù)形結(jié)合可知SKIPIF1<0的取值范圍是SKIPIF1<0,故選:A.02解不等式、求參數(shù)范圍、最值問(wèn)題5.(2024·四川內(nèi)江·統(tǒng)考三模)若關(guān)于x的不等式SKIPIF1<0有且只有一個(gè)整數(shù)解,則正實(shí)數(shù)a的取值范圍是(
)A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<0【答案】A【解析】原不等式可化簡(jiǎn)為SKIPIF1<0,設(shè)SKIPIF1<0,SKIPIF1<0,由SKIPIF1<0得,SKIPIF1<0,令SKIPIF1<0可得SKIPIF1<0,SKIPIF1<0時(shí),SKIPIF1<0,SKIPIF1<0時(shí),SKIPIF1<0,易知函數(shù)SKIPIF1<0在SKIPIF1<0單調(diào)遞減,在SKIPIF1<0單調(diào)遞增,且SKIPIF1<0,作出SKIPIF1<0的圖象如下圖所示,而函數(shù)SKIPIF1<0恒過(guò)點(diǎn)SKIPIF1<0,要使關(guān)于SKIPIF1<0的不等式SKIPIF1<0有且只有一個(gè)整數(shù)解,則函數(shù)SKIPIF1<0的圖象應(yīng)介于直線SKIPIF1<0與直線SKIPIF1<0之間(可以為直線SKIPIF1<0),又SKIPIF1<0,SKIPIF1<0,∴SKIPIF1<0,SKIPIF1<0,∴SKIPIF1<0,∴SKIPIF1<0.故選:A.6.(2024·陜西漢中·高二統(tǒng)考期末)若函數(shù)SKIPIF1<0(m為實(shí)數(shù))有極大值,則SKIPIF1<0的范圍是(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】D【解析】由題意知SKIPIF1<0,SKIPIF1<0,當(dāng)SKIPIF1<0時(shí),函數(shù)SKIPIF1<0在區(qū)間SKIPIF1<0上單調(diào)遞減,無(wú)極值點(diǎn);當(dāng)SKIPIF1<0時(shí),根據(jù)SKIPIF1<0與SKIPIF1<0的圖象,設(shè)兩個(gè)函數(shù)在第一象限的交點(diǎn)的橫坐標(biāo)為SKIPIF1<0,當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,SKIPIF1<0,函數(shù)SKIPIF1<0在區(qū)間SKIPIF1<0上單調(diào)遞增,當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,SKIPIF1<0,函數(shù)SKIPIF1<0在區(qū)間SKIPIF1<0上單調(diào)遞減,故當(dāng)SKIPIF1<0時(shí),函數(shù)SKIPIF1<0有一個(gè)極大值點(diǎn).故選:D7.(2024·山西臨汾·高三統(tǒng)考階段練習(xí))已知三次函數(shù)SKIPIF1<0的導(dǎo)函數(shù)為SKIPIF1<0,若方程SKIPIF1<0有四個(gè)實(shí)數(shù)根,則實(shí)數(shù)a的范圍為(
)A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<0【答案】A【解析】令SKIPIF1<0得SKIPIF1<0或SKIPIF1<0,可得SKIPIF1<0在SKIPIF1<0上單調(diào)遞增,在SKIPIF1<0單調(diào)遞減,在SKIPIF1<0上單調(diào)遞增,算出SKIPIF1<0的極值,又方程SKIPIF1<0有四個(gè)實(shí)數(shù)根可轉(zhuǎn)化為方程SKIPIF1<0,或方程SKIPIF1<0共有四個(gè)實(shí)數(shù)根,結(jié)合函數(shù)圖象列出SKIPIF1<0滿足的條件即可.SKIPIF1<0,SKIPIF1<0由SKIPIF1<0得SKIPIF1<0或SKIPIF1<0,又SKIPIF1<0,所以SKIPIF1<0在SKIPIF1<0上單調(diào)遞增,在SKIPIF1<0單調(diào)遞減,在SKIPIF1<0上單調(diào)遞增,SKIPIF1<0的極大值為SKIPIF1<0,SKIPIF1<0的極小值為SKIPIF1<0;又SKIPIF1<0有四個(gè)實(shí)數(shù)根,故方程SKIPIF1<0,或方程SKIPIF1<0共有四個(gè)實(shí)數(shù)根,SKIPIF1<0SKIPIF1<0或SKIPIF1<0或SKIPIF1<0,解得:SKIPIF1<0.故選:A03解決以幾何圖形為背景的代數(shù)問(wèn)題8.(2024·云南曲靖·高三校聯(lián)考階段練習(xí))已知曲線C:SKIPIF1<0.①曲線C的圖像一定經(jīng)過(guò)第三象限;②若SKIPIF1<0為曲線C上一點(diǎn),則SKIPIF1<0;③存在SKIPIF1<0,SKIPIF1<0與曲線C有四個(gè)交點(diǎn);④直線SKIPIF1<0與曲線C無(wú)公共點(diǎn)當(dāng)且僅當(dāng)SKIPIF1<0.其中所有正確結(jié)論的序號(hào)是.【答案】①②【解析】當(dāng)SKIPIF1<0時(shí),曲線SKIPIF1<0的方程為SKIPIF1<0,即SKIPIF1<0,曲線SKIPIF1<0是雙曲線的一部分;當(dāng)SKIPIF1<0時(shí),曲線SKIPIF1<0的方程為SKIPIF1<0,即SKIPIF1<0,曲線SKIPIF1<0是橢圓的一部分;當(dāng)SKIPIF1<0時(shí),曲線SKIPIF1<0的方程為SKIPIF1<0,曲線SKIPIF1<0不存在;當(dāng)SKIPIF1<0時(shí),曲線SKIPIF1<0的方程為SKIPIF1<0,即SKIPIF1<0,曲線SKIPIF1<0是雙曲線的一部分,其中雙曲線SKIPIF1<0和SKIPIF1<0有一條共同的漸近線SKIPIF1<0,綜上可得,畫(huà)出曲線SKIPIF1<0的圖象,如圖所示,由圖象可知,曲線SKIPIF1<0的圖象經(jīng)過(guò)第三象限,所以①正確;由圖象知,曲線SKIPIF1<0的圖象上的點(diǎn)都在直線SKIPIF1<0的下方,所以當(dāng)SKIPIF1<0在曲線SKIPIF1<0上時(shí),有SKIPIF1<0,所以②正確;直線SKIPIF1<0時(shí)表示與SKIPIF1<0平行或重合的直線,由曲線SKIPIF1<0的圖象知,直線SKIPIF1<0與曲線SKIPIF1<0不可能有四個(gè)交點(diǎn),所以③錯(cuò)誤;設(shè)直線SKIPIF1<0與橢圓SKIPIF1<0相切,聯(lián)立方程組SKIPIF1<0整理得SKIPIF1<0,由SKIPIF1<0,解得SKIPIF1<0,結(jié)合曲線SKIPIF1<0的圖象,取SKIPIF1<0,即SKIPIF1<0與曲線SKIPIF1<0相切,所以直線SKIPIF1<0與曲線SKIPIF1<0無(wú)公共點(diǎn),結(jié)合曲線SKIPIF1<0的圖象,可知SKIPIF1<0或SKIPIF1<0,所以④不正確.故答案為:①②.9.(2024·江蘇鎮(zhèn)江·高三江蘇省鎮(zhèn)江第一中學(xué)??茧A段練習(xí))過(guò)雙曲線SKIPIF1<0的右支上一點(diǎn)SKIPIF1<0,分別向⊙SKIPIF1<0和⊙SKIPIF1<0作切線,切點(diǎn)分別為SKIPIF1<0,則SKIPIF1<0的最小值為.
【答案】17【解析】由SKIPIF1<0,得SKIPIF1<0,所以雙曲線的焦點(diǎn)坐標(biāo)為SKIPIF1<0,由圓的方程知:圓SKIPIF1<0圓心的坐標(biāo)為SKIPIF1<0,半徑SKIPIF1<0,圓SKIPIF1<0圓心的坐標(biāo)為SKIPIF1<0,半徑SKIPIF1<0,SKIPIF1<0分別為兩圓切線,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0為雙曲線右支上的點(diǎn),且雙曲線焦點(diǎn)為SKIPIF1<0,又SKIPIF1<0(當(dāng)為雙曲線右頂點(diǎn)時(shí)取等號(hào)),SKIPIF1<0,即SKIPIF1<0的最小值為SKIPIF1<0.故答案為:17.10.(2024·全國(guó)·高三專題練習(xí))如圖,在圓內(nèi)接四邊形SKIPIF1<0中,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0.若SKIPIF1<0為SKIPIF1<0的中點(diǎn),則SKIPIF1<0的值為.【答案】SKIPIF1<0【解析】由余弦定理知SKIPIF1<0,所以SKIPIF1<0,由正弦定理得SKIPIF1<0,所以SKIPIF1<0為圓的直徑,所以SKIPIF1<0,所以SKIPIF1<0,從而SKIPIF1<0,又SKIPIF1<0,所以SKIPIF1<0為等邊三角形;以SKIPIF1<0為原點(diǎn),以SKIPIF1<0所在直線為SKIPIF1<0軸,SKIPIF1<0所在直線為SKIPIF1<0軸建立如下圖所示的平面直角坐標(biāo)系:則SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,故SKIPIF1<0.故答案為:SKIPIF1<0.11.(2024·貴州貴陽(yáng)·高三貴陽(yáng)一中??茧A段練習(xí))已知平面向量SKIPIF1<0滿足:SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,設(shè)向量SKIPIF1<0(SKIPIF1<0為實(shí)數(shù)),則SKIPIF1<0的取值范圍為.【答案】SKIPIF1<0【解析】如圖所示,以SKIPIF1<0為坐標(biāo)原點(diǎn),邊長(zhǎng)為2的正方形SKIPIF1<0的SKIPIF1<0,SKIPIF1<0所在直線為SKIPIF1<0軸和SKIPIF1<0軸,建立坐標(biāo)系,設(shè)SKIPIF1<0,SKIPIF1<0,SKIPIF1<0為線段SKIPIF1<0上一點(diǎn),則SKIPIF1<0,因?yàn)镾KIPIF1<0,所以以SKIPIF1<0為圓心,SKIPIF1<0為半徑畫(huà)圓,點(diǎn)SKIPIF1<0為圓上一點(diǎn),設(shè)SKIPIF1<0,SKIPIF1<0,,所以SKIPIF1<0,所以SKIPIF1<0,SKIPIF1<0,所以SKIPIF1<0,所以SKIPIF1<0,可得直線SKIPIF1<0表示斜率為SKIPIF1<0,縱截距為SKIPIF1<0的直線,當(dāng)圓心為點(diǎn)SKIPIF1<0時(shí),SKIPIF1<0與SKIPIF1<0相切且點(diǎn)SKIPIF1<0在SKIPIF1<0軸的下方時(shí),可得圓SKIPIF1<0的方程為SKIPIF1<0,可得切線坐標(biāo)為SKIPIF1<0,此時(shí)SKIPIF1<0,取得最小值;當(dāng)圓心為點(diǎn)SKIPIF1<0時(shí),SKIPIF1<0經(jīng)過(guò)圓心時(shí),圓SKIPIF1<0的方程為SKIPIF1<0,當(dāng)點(diǎn)SKIPIF1<0時(shí),此時(shí)SKIPIF1<0,取得最大值,所以SKIPIF1<0的取值范圍為SKIPIF1<0.故答案為:SKIPIF1<0.04解決數(shù)學(xué)文化、情境問(wèn)題12.(2024·福建漳州·統(tǒng)考模擬預(yù)測(cè))公元SKIPIF1<0年,唐代李淳風(fēng)注《九章》時(shí)提到祖暅的“開(kāi)立圓術(shù)”.祖暅在求球的體積時(shí),使用一個(gè)原理:“冪勢(shì)既同,則積不容異”.“冪”是截面積,“勢(shì)”是立體的高,意思是兩個(gè)同高的立體,如在等高處的截面積相等,則體積相等.更詳細(xì)點(diǎn)說(shuō)就是,介于兩個(gè)平行平面之間的兩個(gè)立體,被任一平行于這兩個(gè)平面的平面所截,如果兩個(gè)截面的面積相等,則這兩個(gè)立體的體積相等.上述原理在中國(guó)被稱為“祖暅原理”.SKIPIF1<0打印技術(shù)發(fā)展至今,已經(jīng)能夠滿足少量個(gè)性化的打印需求,現(xiàn)在用SKIPIF1<0打印技術(shù)打印了一個(gè)“睡美人城堡”.如圖,其在高度為SKIPIF1<0的水平截面的面積SKIPIF1<0可以近似用函數(shù)SKIPIF1<0,SKIPIF1<0擬合,則該“睡美人城堡”的體積約為(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】D【解析】如下圖所示:圓錐SKIPIF1<0的高和底面半徑為SKIPIF1<0,平行于圓錐SKIPIF1<0底面的截面角圓錐SKIPIF1<0的母線SKIPIF1<0于點(diǎn)SKIPIF1<0,設(shè)截面圓圓心為點(diǎn)SKIPIF1<0,且SKIPIF1<0,則SKIPIF1<0,易知SKIPIF1<0,則SKIPIF1<0,即SKIPIF1<0,可得SKIPIF1<0,所以,截面圓圓SKIPIF1<0的半徑為SKIPIF1<0,圓SKIPIF1<0的面積為SKIPIF1<0,又因?yàn)镾KIPIF1<0,根據(jù)祖暅原理知,該“睡美人城堡”的體積與一個(gè)底面圓半徑為SKIPIF1<0,高為SKIPIF1<0的圓錐的體積近似相等,所以該“睡美人城堡”的體積約為SKIPIF1<0,故選:D.13.(2024·北京順義·高三統(tǒng)考期末)《九章算術(shù)》中將底面為矩形且有一條側(cè)棱與底面垂直的四棱錐稱為“陽(yáng)馬”.現(xiàn)有一“陽(yáng)馬”SKIPIF1<0,SKIPIF1<0平面SKIPIF1<0,SKIPIF1<0,SKIPIF1<0為底面SKIPIF1<0及其內(nèi)部的一個(gè)動(dòng)點(diǎn)且滿足SKIPIF1<0,則SKIPIF1<0的取值范圍是(
)A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<0【答案】D【解析】SKIPIF1<0平面SKIPIF1<0,SKIPIF1<0,連接SKIPIF1<0,由SKIPIF1<0,可得SKIPIF1<0,四邊形SKIPIF1<0為矩形,以SKIPIF1<0為SKIPIF1<0軸建立如圖所示坐標(biāo)系,則SKIPIF1<0,設(shè)SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0,所以SKIPIF1<0SKIPIF1<0因?yàn)镾KIPIF1<0,則SKIPIF1<0,則SKIPIF1<0,所以SKIPIF1<0.故選:D14.(2024·山東濟(jì)寧·高三統(tǒng)考期末)九連環(huán)是我國(guó)古代至今廣為流傳的一種益智游戲,它由九個(gè)鐵絲圓環(huán)相連成串按一定移動(dòng)圓環(huán)的次數(shù)決定解開(kāi)圓環(huán)的個(gè)數(shù).在某種玩法中,用SKIPIF1<0表示解下SKIPIF1<0個(gè)圓環(huán)所需要少移動(dòng)的次數(shù),數(shù)列SKIPIF1<0滿足SKIPIF1<0且SKIPIF1<0則解下5個(gè)環(huán)所需要最少移動(dòng)的次數(shù)為(
)A.7 B.10 C.16 D.31【答案】C【解析】SKIPIF1<0
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