(2008•威海)下列計(jì)算正確的是( )
A.
B.x5+x5=x10
C.x8÷x2=x4
D.(-a32=a6
【答案】分析:根據(jù)負(fù)整數(shù)指數(shù)冪、冪的乘方與積的乘方、零指數(shù)冪、同底數(shù)冪的除法、合并同類(lèi)項(xiàng)等知識(shí)點(diǎn)進(jìn)行解答.
解答:解:A、(-×3-1=1×=;故不對(duì);
B、x5+x5=2x5;故不對(duì);
C、x8÷x2=x6;故不對(duì);
D、(-a32=a6,正確;
故選D.
點(diǎn)評(píng):主要考查了零指數(shù)冪,負(fù)指數(shù)冪和平方的運(yùn)算.負(fù)指數(shù)為正指數(shù)的倒數(shù);任何非0數(shù)的0次冪等于1.
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