问题
解答题
把(x-y)看成一个整体合并同类项:5(x-y)2+2(x-y)-3(x-y)2+
|
答案
原式=5(x-y)2-3(x-y)2+2(x-y)+
(x-y)-3.51 2
=(5-3)(x-y)2+(2+
)(x-y)-3.51 2
=2(x-y)2+
(x-y)-3.5.5 2
把(x-y)看成一个整体合并同类项:5(x-y)2+2(x-y)-3(x-y)2+
|
原式=5(x-y)2-3(x-y)2+2(x-y)+
(x-y)-3.51 2
=(5-3)(x-y)2+(2+
)(x-y)-3.51 2
=2(x-y)2+
(x-y)-3.5.5 2