y |
x+y |
A.不变 | B.扩大2倍 | C.缩小2倍 | D.缩小4倍 |
2y |
2x+2y |
2y |
2(x+y) |
y |
x+y |
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 |
2m |
m+2n |
A.扩大两倍 | B.不变 | C.缩小两倍 | D.无法确定 |
2xy |
x+y |
A.扩大到原来的2倍 | B.缩小2倍 | ||
C.是原来的
| D.不变 |
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