7 |
9 |
1 |
2 |
1 |
2 |
43 |
48 |
| ||
48 |
3
| ||
4 |
x2+(12-x)2 |
2(x-6)2+72 |
2 |
2 |
7 |
9 |
x2+y2-2xy•
|
xy |
2xy-
|
8 |
3 |
xy |
9 |
64 |
1 |
2 |
7 |
9 |
2
| ||
9 |
| ||
32 |
| ||
32 |
5 |
5 |
1 |
2 |
1 |
2 |
a |
sinA |
b |
cosB |
A.30° | B.45° | C.120° | D.60° |
A.a≥b | B.a>b |
C.a<b | D.b的大小关系不定 |
A.a=4,b=5,tanA=2,tanB=3,a=1有一解 | ||||
B.a=5,b=4,A=60°有两解 | ||||
C.a=
| ||||
D.a=
|
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