A.abc | B.(a+b)c2 |
C.c3 | D.c2(acosA+bcosB) |
b |
c |
a |
c |
b |
c |
a |
c |
a3b+ab3 |
c |
5 |
3 |
A.0°<α<30° | B.30°<α<45° | C.45°<α<60° | D.60°<α<90° |
2 |
| ||
2 |
2 |
3 |
AC |
AB |
A.
| B.
| C.
| D.
|
1 |
2 |
A.0°≤A≤60° | B.60°≤A<90° | C.0°<A≤30° | D.30°≤A<90° |
A.1 | B.
| C.2 | D.
|
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