A.方程x(x-2)=x-2的根为2 | ||||||
B.函数y=
| ||||||
C.正三角形旋转60°后可以和原图形重合 | ||||||
D.已知圆锥侧面展开图的圆心角为90°,则该圆锥的底面半径与母线长的比为1:4 |
1 |
2 |
90πR |
180 |
R |
4 |
2-x |
1 |
x-1 |
3 |
2-x |
| ||
x |
A.x≥-2且x≠0 | B.x≥-2 | C.x>-2或x≠0 | D.x>-2 |
A.
| ||||
B.-1的立方根是-1 | ||||
C.函数y=
| ||||
D.若点P(3,a)和点Q(b,-3)关于x轴对称,则a+b的值为6 |
2x+1 |
x |
x-2 |
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