人教版-2021年河北省中考數(shù)學試卷解析

2021年河北省初中畢業(yè)生升學文化課考試數(shù)學試卷本試卷分卷Ⅰ和卷Ⅱ兩部分；卷Ⅰ為選擇題，卷Ⅱ為非選擇題．本試卷滿分為120分，考試時間為120分鐘．卷Ⅰ選擇題，共42分)23)1．℃℃℃℃2.4765nnnan1n1n46x2xx23B。||4＝335512202＝33:0mm，x．＝xx．＝xxxx．＝．＝xx＝x:y=2632x6yx:2mx＝:②y隨x③若；④若.:m2，.若====35462，23=..解析:3=2=C=，=23S=陰影2．32．π33602223π＝扇形AOD＝360B=C=.M在BCM在CBABCDDCDEABCFABAE=EF=FB=5，DE=12，動點DCy=EPF1y=S＝5△EPF22021年河北省初中畢業(yè)生升學文化課考試數(shù)學試卷卷Ⅱ(非選擇題，共78分)三二得分43)AA．1:231622xy+y2x+yx+)÷．xx22xxyDN沿，B=．CxA；1111222233C)Cm．1C2C3C4┉C3若x，求x.)①②::10%35544586672②x:5.3))PA1P+bt.的tMl:xby交y，當t=3x4∴yxby過時23bxby過時44byx)⌒中，===O6..=；⌒Q:4分5分T作H⌒與6分62·········································7分∴∵22=21212121286=即=······················································9分5分)QQ=W+，而WnWxx的nx和n；次數(shù)n速度x指數(shù)Q21當x=Q=n4060若n=3Qx設n=2x=nxQm4201004ac－b2b－，2a++(:)4aWkxknxQkxknx1002212121k240kk2121k160k2k61221Qx6∴2·····························································4分1670n2·························································································6分1Qxx當21a0x由Q······················9分12()1[40(1m62(1m40(1m·············分212(m%)m%0m%m%)2即2分)α=圖；V=S)BCQ液)4]=1=當α=4.3:3··········································································2分1)······································4分334∴6分7分12∴y，y，·············································分4x14PB23'BPB'B=37o，∴∠B'PBPB=4'當6'過點G作GH⊥BBH在△B''B=HB=23'423'G1313612328∵+S==S22