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1 只改变抛物线y=2x~2-4x+1的开口方向,可得抛物线 (A) y=-2x~2-4x+1. (B) y=-2x~2+4x+1. (C) y=-2x~2+4x-1. (D) y=-2x~2+4x-3. 2 过原点,在对称轴右侧上升的抛物线
1 Only change the direction of the parabola y=2x~2-4x+1, and obtain the parabola (A) y=-2x~2-4x+1. (B) y=-2x~2+4x+1. (C y=-2x~2+4x-1. (D) y=-2x~2+4x-3. 2 Over the origin, the parabola rising to the right of the symmetry axis