a |
b |
a |
b |
a |
b |
a |
b |
a |
a |
| ||||
|
|
| ||||
|
|
2×(-4)+3×7 | ||
|
13 | ||
|
| ||
5 |
| ||
5 |
AB |
BC |
AB |
A.锐角三角形 | B.直角三角形 |
C.钝角三角形 | D.等腰直角三角形 |
a |
b |
a |
b |
a |
a |
b |
A.0 | B.1 | C.3 | D.5 |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
AB |
AC |
AB |
AC |
AB |
AC |
i |
j |
a |
i |
j |
b |
i |
j |
a |
b |
A.25 | B.24 | C.5 | D.0 |
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