问题
选择题
计算(x-y)3÷(y-x)=( )
A.(x-y)2
B.(y-x)2
C.-(x-y)2
D.(x+y)2
答案
(x-y)3÷(y-x),
=(x-y)3÷[-(x-y)],
=-(x-y)2.
故选C.
计算(x-y)3÷(y-x)=( )
A.(x-y)2
B.(y-x)2
C.-(x-y)2
D.(x+y)2
(x-y)3÷(y-x),
=(x-y)3÷[-(x-y)],
=-(x-y)2.
故选C.