七年級(jí)數(shù)學(xué)下冊(cè)1.18同底數(shù)冪的除法練習(xí)題(最新整理)

1、1.18 同底數(shù)冪的除法【課內(nèi)四基達(dá)標(biāo)】1.選擇題(1)下列算式中正確的是().a.(0.001)00b.(0.1)-20.01c.(10- 25)01d.10-40.0001(2)下列計(jì)算正確的是().a.a3m-5a5-ma4 m+10b.x4x3x2x3c.(-y)5(-y)3-y2d.ma+2bmb-am2a+b (3)若 x2m+nynx2y2=x5y,則 m、n 的值分別為()a.m=3,n=2b.m=2,n=2c.m=2,n=3d.m=3,n=12. 填空題(1)(-a2)3a3 (2)108104 (3)y10(y8)y4 (4)(5x-2y)4(2y-5x)2 21(5)若

2、32x-11，則 x；若 3x27，則 x.(6)用科學(xué)記數(shù)法表示 0.0001234108. 3.用整數(shù)或小數(shù)表示下列各數(shù)(1)9.932103(2)7.2110-5(3)-4.21 107(4)-3.02 110-34.用科學(xué)記數(shù)法表示下列各數(shù)(1)732400(2)-6643919000(3)0.00000006005(4)-0.000002175.計(jì)算(1)(x3)2x2x+x3(-x)2(- x)21(2)(-21)8(-21)3(-2)2(3)(x2a+3b+4c)m(xa)2m(x3)bm(xm)4c(4)(x+y-z)5(z-x-y)3(5)12(x+y)3-(-x-y)3+3

3、(-x-y)3(-y-x)【能力素質(zhì)提高】1.已知 252m52m-1125，求 m 的值.2.已知(2x2+3y2)23(2x2+3y2)40 ，求 x、y 的值.3. 已知 xa24，xb=16,求 xa-b 的值.【滲透拓展創(chuàng)新】am填空：amam=am=1(a0)，又amam=am-m=a0(a0)，a0(a0) .【中考真題演練】11 66 + 12 67 + 13 68 + 14 69 + 15 70已知 a=11 5 + 12 6 + 13 7 + 14 8 + 15 9100，問 a 的整數(shù)部分是多少?【課內(nèi)四基達(dá)標(biāo)】1.(1)d(2)d(3)c2.(1)-a3(2)10410

4、000(3)y21參考答案(4)25x2-20xy+4y2(5)2，-3(6)1.2341043.(1)9932(2)0.0000721(3)-42100000(4)-0.0030214.(1)7.324105(2)-6.643919109(3)6.00510-8(4)-2.1710-615.(1)2x3(2)-8【能力素質(zhì)提高】(3)x(4)-x2-y2-z2-2xy+2xz+2yz(5)-10x2-20xy-10y231.m12.x0,y03.2【滲透拓展創(chuàng)新】1，【中考真題演練】101提示：設(shè) 68m“”“”at the end, xiao bian gives you a passag

5、e. minand once said, people who learn to learn are very happy people. in every wonderful life, learning is an eternal theme. as a professional clerical and teaching position, i understand the importance of continuous learning, life is diligent, nothing can be gained, only continuous learning can achieve better self. only by constantly learning and mastering the latest relevant knowledge, can employees from all walks of life keep up with the pace of enterprise development and innovate to meet the needs of the market. this document is also edited by my studio profes