15
| ||
2 |
7 |
2 |
5 |
2 |
3 |
2 |
b2+c2-a2 |
2bc |
| ||||||
2×
|
1 |
2 |
1 |
2 |
15 |
4 |
3 |
A.∀x∈R,2x-1>0 | B.∃x∈R,lgx<1 |
C.∀x∈R,x2>0 | D.∃x∈R,tanx=2 |
x2 |
a2 |
y2 |
b2 |
AB |
BF |
| ||
2 |
a |
b |
a |
b |
a |
b |
5 |
4 |
A.1 个 | B.2 个 | C.3 个 | D.4 个 |
π |
2 |
π |
3 |
3 |
5 |
π |
3 |
π |
12 |
a |
b |
c |
a |
b |
c |
A.1个 | B.2个 | C.3个 | D.4个 |
π |
4 |
1 |
sinx |
A.(2,3) | B.(-∞,1]∪(2,+∞) | C.(-∞,-2)∪[3,+∞) | D.(-∞,-2)∪(1,2] |
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