. |
m |
3 |
x |
4 |
. |
n |
x |
4 |
x |
4 |
. |
m |
. |
n |
π |
3 |
1 |
2 |
m |
3 |
x |
4 |
n |
x |
4 |
x |
4 |
m |
n |
3 |
x |
4 |
x |
4 |
x |
4 |
| ||
2 |
x |
2 |
1 |
2 |
x |
2 |
1 |
2 |
x |
2 |
π |
6 |
1 |
2 |
x |
2 |
π |
6 |
1 |
2 |
π |
3 |
x |
2 |
π |
6 |
x |
2 |
π |
6 |
1 |
2 |
a2+b2-c2 |
2ab |
1 |
2 |
a2+b2-c2 |
2ab |
1 |
2 |
b2+c2-a2 |
2bc |
1 |
2 |
π |
3 |
2π |
3 |
π |
6 |
B |
2 |
π |
6 |
π |
2 |
3 |
2 |
1 |
3 |
sin(π-2α)+cos2α |
2cos2α+sin2α+2 |
3 |
5 |
A.等边三角形 | B.直角三角形 |
C.等腰三角形 | D.等腰直角三角形 |
AB |
AB |
AC |
BA |
BC |
CA |
CB |
A.等边三角形 | B.锐角三角形 | C.直角三角形 | D.钝角三角形 |
A.1 | B.2 | C.3 | D.4 |
A.钝角三角形 | B.直角三角形 | C.锐角三角形 | D.不能确定 |
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