a |
b |
c |
d |
A.
| B.
| C.
| D.
|
a |
b |
c |
d |
b |
a |
d |
c |
a |
b |
c |
d |
a-b |
b |
c-d |
d |
a |
b |
c |
d |
a |
a+b |
c |
c+d |
a |
b |
c |
d |
a+d |
b+c |
a |
b |
| ||
2 |
3-
| ||
2 |
A.a是b、c 的比例中项 | B.c是a、b的比例中项 |
C.b是a、c的比例中项 | D.1是a、b、c的第四比例项 |
x+2y-z |
x-y+3z |
A.25:1 | B.5:1 | C.
| D.
|
x |
y |
2 |
3 |
3x+2y |
2x-3y |
4x+3y-2z |
x+y+z |
3a-2b |
b |
1 |
3 |
a |
b |
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