题目内容
(1)5a2-3a2+7a2
(2)2x2-xy+3y2+4xy-
y2-x2
(3)5a2b-2ab2-(3a2b-8ab2)
(4)
a2+[(
a-
)-(a2-
a+
)].
(2)2x2-xy+3y2+4xy-
9 |
2 |
(3)5a2b-2ab2-(3a2b-8ab2)
(4)
1 |
2 |
1 |
3 |
1 |
4 |
1 |
2 |
1 |
3 |
(1)原式=9a2;
(2)原式=x2+3xy-
y2;
(3)原式=5a2b-2ab2-3a2b+8ab2=2a2b+6ab2;
(4)原式=
a2+
a-
-a2+
a-
=-
a2+
a-
.
(2)原式=x2+3xy-
3 |
2 |
(3)原式=5a2b-2ab2-3a2b+8ab2=2a2b+6ab2;
(4)原式=
1 |
2 |
1 |
3 |
1 |
4 |
1 |
2 |
1 |
3 |
1 |
2 |
5 |
6 |
7 |
12 |
练习册系列答案
相关题目