3 |
x+y |
4 |
y+z |
5 |
z+x |
x2+y2+z2 |
xy+yz+zx |
3 |
x+y |
4 |
y+z |
5 |
z+x |
|
|
x+y |
3 |
y+z |
4 |
x+z |
5 |
x+y |
3 |
y+z |
4 |
x+z |
5 |
|
x2+y2+z2 |
xy+yz+zx |
(22+12+32)a2 |
(2×1+1×3+2×3)a2 |
14 |
11 |
14 |
11 |
1 |
6 |
21-5m |
m2-9 |
m |
m2-9 |
m |
m+3 |
m-3 |
m+3 |
A.-1 | B.-
| C.
| D.1 |
A.-1 | B.1 | C.2 | D.3 |
3x2-7x+2 |
(x-1)(x+1) |
A |
x-1 |
B |
x+1 |
a2(
| ||||||||||||
a(
|
A.abc | B.a+b+c | C.
| D.-(a+b+c) |
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