问题
解答题
(1)
(2)
|
答案
(1)
+a+3b a+b a-b a+b
=a+3b+a-b a+b
=2(a+b) a+b
=2;
(2)
-2xy2+1 (x-y)2 1+2x2y (y-x)2
=2xy2+1-1-2x2y (x-y)2
=2xy(y-x) (x-y)2
=
.2xy y-x
(1)
(2)
|
(1)
+a+3b a+b a-b a+b
=a+3b+a-b a+b
=2(a+b) a+b
=2;
(2)
-2xy2+1 (x-y)2 1+2x2y (y-x)2
=2xy2+1-1-2x2y (x-y)2
=2xy(y-x) (x-y)2
=
.2xy y-x