a7b2 | ||
|
a2-b2 | ||
a2
|
a2(b-a) |
2 |
a7b2 | ||
|
(a-b)(a+b) | ||
a2b
|
2 |
a2(b-a) |
a14b4 |
3(a+b)4 |
(a-b)4•(a+b)4 |
a8b2 |
8 |
a6(b-a)3 |
8 |
3 |
2x |
1+x |
|
lg2+lg5-lg8 |
lg50-lg40 |
1 |
2 |
1 |
2 |
x
| ||||
x2+x-2+3 |
1 |
3 |
A.a<b<c | B.c<a<b | C.a<c<b | D.c<b<a |
A.a<c<b | B.a<b<c | C.c<b<a | D.c<a<b |
A.(-1,1) | B.(-1,0)∪(0,1) | ||||
C.∅ | D.(-∞,-
|
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