题目内容
先化简再求值:-
-2(a-
b2)-(
a-
b2),其中a=-2,b=
| 1 |
| 2 |
| 1 |
| 2 |
| 3 |
| 2 |
| 1 |
| 3 |
| 3 |
| 2 |
原式=-
-2a+b2-
a+
b2=-
-
a+
b2,
当a=-2,b=
时,
原式=-
-
a+
b2,
=-
-
×(-2)+
×(
)2,
=-
+7+3,
=
.
| 1 |
| 2 |
| 3 |
| 2 |
| 1 |
| 3 |
| 1 |
| 2 |
| 7 |
| 2 |
| 4 |
| 3 |
当a=-2,b=
| 3 |
| 2 |
原式=-
| 1 |
| 2 |
| 7 |
| 2 |
| 4 |
| 3 |
=-
| 1 |
| 2 |
| 7 |
| 2 |
| 4 |
| 3 |
| 3 |
| 2 |
=-
| 1 |
| 2 |
=
| 19 |
| 2 |
练习册系列答案
相关题目