A.(a+b)(
| B.a2+
| ||||||||
C.|a-b|+
| D.(a+b)2≤2(a2+b2) |
1 |
a |
1 |
b |
b |
a |
a |
b |
1 |
1 |
a2 |
1 |
a |
1 |
a |
( a - 1 )( a2-1) |
a |
(a-1)2( a +1 ) |
a |
1 |
2 |
1 |
a-b |
3 |
2 |
A.10 | B.6
| C.4
| D.18
|
1 |
a2 |
1 |
b2 |
A.
| B.
| C.1 | D.3 |
x2 |
y |
x3 |
y4 |
y2 |
xz |
AB |
AC |
3 |
1 |
2 |
1 |
x |
4 |
y |
A.9 | B.8 | C.18 | D.16 |
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