把（x+y）²-（x+y）-6=0怎么分解成（x+y-3）（x+y-2）=0?
人气：155 ℃ 时间：2020-09-10 00:19:58
解答
设x+y=a那么原式就变形为
a²-a-6=0
-6=-3*2所以上式可以分解成为：(a-3)(a+2）=0所以楼主你把题写错了应该为：（x+y-3)(x+y+2)=0
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