a |
b+c |
b |
c+a |
c |
a+b |
a |
-a |
a+b+c |
b+c+c+a+a+b |
a+b+c |
2(a+b+c) |
1 |
2 |
1 |
2 |
A.a:b=c:d | B.a:c=d:b | C.a:b=d:c | D.b:a=d:c |
x |
3 |
y |
5 |
z |
7 |
x+y+z |
x |
x |
2 |
y |
3 |
z |
4 |
x+y+z |
x+y-z |
A.±6 | B.6 | C.±3 | D.3 |
A.a=3,b=6,c=2,d=4 | B.a=1,b=
| ||||||
C.a=4,b=6,c=5,d=10 | D.a=2,b=
|
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