问题
填空题
直接写出结果: (1)
(2)
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答案
(1)
+m-n a
=m+n a
=m-n+m+n a
;2m a
(2)
-x2 x+y
=y2 x+y
=x2-y2 x+y
=x-y.(x+y)(x-y) x+y
直接写出结果: (1)
(2)
|
(1)
+m-n a
=m+n a
=m-n+m+n a
;2m a
(2)
-x2 x+y
=y2 x+y
=x2-y2 x+y
=x-y.(x+y)(x-y) x+y