A.150° | B.135° | C.120° | D.90° |
(a-3)(a+1) |
4 |
a2+3 |
4 |
(a-3)(a+1) |
4 |
a2+3 |
4 |
(a-3)(a+1) |
4 |
a2+3 |
4 |
a2+3 |
4 |
(a-3)(a+1) |
4 |
(a-3)(a+1) |
4 |
1 |
2 |
A.a=4,b=5,c=6 | B.a=1,b=1.5,c=5 |
C.a=2,b=3,c=2.5 | D.a=2,b=2.5,c=3 |
1 |
13 |
1 |
11 |
1 |
5 |
| ||
2 |
3 |
3 |
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