x+y |
2x |
A.扩大3倍 | B.不变 | C.缩小3倍 | D.缩小6倍 |
x+y |
2x |
3x+3y |
6x |
3(x+y) |
3×2x |
x+y |
2x |
ab |
a+b |
A.是原来的2倍 | B.原来的4倍 | ||
C.是原来的
| D.不变 |
b2+c2 |
a2 |
2x |
x+5 |
( ) |
3x+15 |
a+b |
ab |
A.扩大为原来2倍 | B.缩小为原来
| ||
C.不变 | D.缩小为原来的
|
(a+b+c)(a3+b3+c3) |
bc+ca+ab |
A.9 | B.8 | C.4 | D.3 |
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