A.(2,-11) | B.(-2,7) | C.(2,11) | D.(2,-3) |
b |
2a |
4ac-b2 |
4a |
1 |
4 |
A.开口向上,直线x=2,(-2,3) |
B.开口向下,直线x=-2,(-2,-3) |
C.开口向上,直线x=-2,(2,3) |
D.开口向上,直线x=-2,(-2,3) |
A.(3,5) | B.(-3,5) | C.(-3,-5) | D.(3,-5) |
A.s=1+t+5t2 | B.y=22+2x | C.y=-2+3x2 | D.y=100(1+x)2 |
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