A.
| B.
| C.
| D.
|
2ab |
a+b |
2×10a×10b |
10a+10b |
20ab |
a+b |
a+b |
2ab |
10a+10b |
2×10a×10b |
a+b |
20ab |
1 |
10 |
a+2b |
a+b |
10a+2×10b |
10a+10b |
a+2b |
a+b |
2 |
a+b |
2 |
10a+10b |
2 |
10(a+b) |
1 |
10 |
xy |
x+y |
A.扩大3倍 | B.缩小3倍 | C.扩大9倍 | D.不变 |
2a2 |
a+b |
A.是原来的20倍 | B.是原来的10倍 | ||
C.是原来的
| D.不变 |
a |
b |
2 |
3 |
a |
a+b |
2x2 |
x+y |
A.不变 | B.扩大2倍 | C.缩小2倍 | D.以上都不对 |
a |
b |
3 |
2 |
a+b |
b |
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