下列计算正确的是A.5y2·4yx2＝9x3y3B.(-2x3ynz)(-4xn+1yn-3)＝8xn+4y2n-3C.(-xn-2y2)(-xym)2＝-xny2m

发布时间：2020-08-07 01:23:53

下列计算正确的是A.5y2·4yx2＝9x3y3B.(-2x3ynz)(-4xn+1yn-3)＝8xn+4y2n-3C.(-xn-2y2)(-xym)2＝-xny2m+2D.(-7a2b3)(5ab2c)＝-2a2b6c

网友回答

C解析A项5y2·4yx2＝20x2y3；B项(-2x3ynz)(-4xn+1yn-3)＝8xn+4y2n-3z；C项(-xn-2y2)(-xym)2＝(-xn-2y2)·(x2y2m)＝-xny2m+2；D项(-7a2b3)(5ab2c)＝-35a3b5c．
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