1 |
a |
1 |
b |
2a+3ab-2b |
a-ab-b |
2a+3ab-2b |
a-ab-b |
(2a+3ab-2b)÷ab |
(a-ab-b)÷ab |
| ||||
|
1 |
a |
1 |
b |
1 |
b |
1 |
a |
2×(-3)+3 |
-3-1 |
3 |
4 |
-3y |
2x |
-2a |
3b |
x |
-2y |
-a+b |
-a-b |
1 |
-x+y |
1 |
a |
1 |
b |
a-2ab-b |
2a-2b+7ab |
A.6 | B.-6 | C.
| D.-
|
x+y |
x-y |
A.不变 | B.是原来的100倍 | ||
C.是原来的200倍 | D.是原来的
|
xy |
x+y |
A.扩大10倍 | B.缩小10倍 | C.扩大100倍 | D.不变 |
x |
3 |
y |
4 |
z |
5 |
xy+yz+zx |
x2+y2+z2 |
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