若将X-Y看成一个整数,合并多项式(X-Y)²+3(X-Y)-2(Y-X),可得?
问题描述:
若将X-Y看成一个整数,合并多项式(X-Y)²+3(X-Y)-2(Y-X),可得?
答
X-Y看成一个整数,合并多项式(X-Y)²+3(X-Y)-2(Y-X),可得?
(X-Y)²+3(X-Y)-2(Y-X),
= (X-Y)²+3(X-Y)+ 2(x-y),
= (X-Y)²+5(X-Y)
= (x-y) (x-y +5 )
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