已知△ABC中,a,b,c分別爲角A,B,C所對的邊,且a=4,b+c=5,tanA+tanB+3=3tanA•tanB,則△ABC的麪積爲( )A. 32B. 33C. 323D. 32
已知△ABC中,a,b,c分別爲角A,B,C所對的邊,且a=4,b c=5,tanA tanB
=
tanA•tanB,則△ABC的麪積爲( )
A.
B.3
C.
D.
3 |
3 |
A.
| ||
2 |
B.3
3 |
C.
3 |
2 |
3 |
D.
3 |
2 |
3 |
3 |
| ||
2 |
3 |
3 |
2 |
3 |
3 |
2 |
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