2018_2019学年七年级数学上册第二章有理数及其运算2.9有理数的乘方课件(新版)北师大版.ppt

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9 有理数的乘方,1.求n个相同因数a的积的运算叫做 ,乘方的结果叫做 ,a叫做 ,n叫做 . 2.(-4)(-4)(-4)(-4)(-4)可表示为( ). A.45 B.45 C.(-4)5 D.-454.负数的 幂是负数,负数的 幂是正数,正数的任何次幂都是 ,0的任何正整数次幂都是 . 5.不计算,判断结果的正负:57结果是 数;(-2)3结果是数;-28结果是 数.,乘方,幂,底数,指数,C,2 018,奇次,偶次,正数,0,正,负,负,1,2,3,4,5,答案,1.(2017四川自贡中考)计算(-1)2 017的结果是( ). A.-1 B.1 C.-2 017 D.2 017,1,2,3,4,5,答案,2.下列式子中,正确的是( ). A.-102=(-10)(-10) B.32=32D.23=32,1,2,3,4,5,答案,3.若n为正整数,则10n表示的数是( ). A.10个n相乘所得的积 B.1后面有n个0 C.1后面有(n-1)个0 D.1后面有(n+1)个0,1,2,3,4,5,答案,1,2,3,4,5,答案,5.观察下列算式:21=2,22=4,23=8,24=16,25=32,26=64,27=128, 28=256,通过观察,你能发现2n的末位数字有什么规律吗?通过你的总结,试写出22 018的末位数字.,

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