2x |
x+y |
A.扩大为原来的2倍 | B.扩大为原来的4倍 | ||
C.不变 | D.变为原来的
|
2x |
x+y |
2?2x |
2(x+y) |
2x |
x+y |
A.
| B.(
| ||||||||
C.
| D.
|
y |
x+y |
A.不变 | B.扩大2倍 | C.缩小2倍 | D.缩小4倍 |
x |
5 |
y |
4 |
z |
3 |
x+y+z |
y+z |
ab |
a+b |
1 |
3 |
bc |
b+c |
1 |
4 |
ca |
c+a |
1 |
5 |
abc |
ab+bc+ca |
2x2 |
x+y |
A.扩大两倍 | B.不变 | C.不能确定 | D.缩小两倍 |
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