A.Rt△ABC中AB=3,BC=4,则AC=5 |
B.极差仅能反映数据的变化范围 |
C.经过点A(2,3)的双曲线一定经过点B(-3,-2) |
D.连接菱形各边中点所得的四边形是矩形 |
AB2+BC2 |
32+42 |
BC2-AB2 |
42-32 |
7 |
6 |
x |
2 |
x |
-1 |
x |
A.y1<y2 |
B.y1>y2 |
C.y1=y2 |
D.y1与y2之间的大小关系不能确定 |
k |
x |
k |
x |
A.
| B.
| |||||||||||||||
C.
| D.
|
b |
x |
A.(2,3) | B.(3,-2) | C.(-2,3) | D.(3,2) |
1 |
x |
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