题目
下列计算错误的是( ) A.x3m+1=(x3)m+1 B.x3m+1=x•x3m C.x3m+1=xm•x2m•x D.x3m+1=(xm)3•x 答案:A【考点】幂的乘方与积的乘方;同底数幂的乘法. 【分析】结合选项分别进行幂的乘方和积的乘方、同底数幂的乘法等运算,然后选择正确选项. 【解答】解:A、(x3)m+1=x3m+3,原式计算错误,故本选项正确; B、x3m+1=x•x3m,原式计算正确,故本选项错误; C、xm•x2m•x=x3m+1,原式计算正确,故本选Read and choose the best answer
-Whose watch is this?
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A.I can't find my watch.
B.It is hers.
C.It's ten.
D.Is it yours?