问题
解答题
计算与化简: (1)化简
(2)计算:(x-8y)(x-y). |
答案
(1)原式=3
-1-22
+2
-2 2 1 2
=
-3 2 2
;3 2
(2)(x-8y)(x-y)
=x2-xy-8xy+8y2
=x2-9xy+8y2.
计算与化简: (1)化简
(2)计算:(x-8y)(x-y). |
(1)原式=3
-1-22
+2
-2 2 1 2
=
-3 2 2
;3 2
(2)(x-8y)(x-y)
=x2-xy-8xy+8y2
=x2-9xy+8y2.