1 |
a2 |
1 |
b2 |
A.
| B.
| C.1 | D.3 |
a2+4b2 |
a2+ 4b2 |
9 |
1 |
a2 |
1 |
b2 |
a2+ 4b2 |
9a2 |
a2+ 4b2 |
9b2 |
1 |
9 |
4 |
9 |
4b2 |
9a2 |
a2 |
9b2 |
5 |
9 |
|
4b2 |
9a2 |
a2 |
9b2 |
x2 |
y |
x3 |
y4 |
y2 |
xz |
AB |
AC |
3 |
1 |
2 |
1 |
x |
4 |
y |
A.9 | B.8 | C.18 | D.16 |
a2+b2 |
a-b |
A.2
| B.
| C.2 | D.1 |
1 |
ab |
1 |
a(a-b) |
A.1 | B.2 | C.3 | D.4 |
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