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【单选题】
下面是某同学 在一次 测验中的计算摘录,其中正确的个数有 ( ) 个 . 13 x 3 ·( -2 x 2 )=-6 x 5 ;24 a 3 b ÷(-2 a 2 b )=-2 a ;3( a 3 ) 2 = a 5 ;4(- a ) 3 ÷(- a )=- a 2 .
A.
1
B.
2
C.
3
D.
4
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