计算(x-y)3•(y-x)=( )A.(x-y)4B.(y-x)4C.-(x-y)4D.(x+y)4
题型:单选题难度:简单来源:不详
计算(x-y)3•(y-x)=( )A.(x-y)4 | B.(y-x)4 | C.-(x-y)4 | D.(x+y)4 |
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答案
(x-y)3•(y-x) =-(x-y)3•(x-y) =-(x-y)3+1 =-(x-y)4; 故选C. |
举一反三
下列计算正确的是( )A.-b2•b3=-b6 | B.(a•b3)2=a2b6 | C.[(-1)2]5=-1 | D.(x-y)2•(x-y)3=(x-y)6 |
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不论x、y为何实数,代数式x2+y2+2x-4y+7的值总不小于______. |
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