题目内容
计算与化简:
(1)化简
-(π-1)0-4
+
(
-1);
(2)计算:(x-8y)(x-y).
(1)化简
| 18 |
|
| 1 |
| 2 |
| 2 |
(2)计算:(x-8y)(x-y).
(1)原式=3
-1-2
+
-
=
-
;
(2)(x-8y)(x-y)
=x2-xy-8xy+8y2
=x2-9xy+8y2.
| 2 |
| 2 |
| ||
| 2 |
| 1 |
| 2 |
=
3
| ||
| 2 |
| 3 |
| 2 |
(2)(x-8y)(x-y)
=x2-xy-8xy+8y2
=x2-9xy+8y2.
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