b |
a |
ab |
a() |
| ||
a+b |
() |
2a+2b |
3a+3b |
9c |
a+b |
() |
b |
a |
ab |
a(a) |
| ||
a+b |
a2+2b2 |
2a+2b |
3a+3b |
9c |
a+b |
(3c) |
x |
3 |
y |
4 |
z |
5 |
xy+yz+zx |
x2+y2+z2 |
14xy(x+y)3 |
4x2(x+y)2 |
2x |
x+y |
A.扩大两倍 | B.不变 | C.缩小两倍 | D.不能确定 |
x+y |
2x |
A.扩大3倍 | B.不变 | C.缩小3倍 | D.缩小6倍 |
ab |
a+b |
A.是原来的2倍 | B.原来的4倍 | ||
C.是原来的
| D.不变 |
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