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1.不论a取任何实数,方程x~2+2y~2sina=1所表示的曲线必不是__。 (A)直线;(B)圆;(C)抛物线;(D)双曲线。 2.曲线C与抛物线y~2=4x-3关于直线y=x对称,则C的方程是__。 (A)x~2=4y-3;(B)y=4x~2-3; (C)x=3y~3-3;(D)x=1/4(y~2+3)。 3.若点A的坐标为(3,2),F为抛物线y~2=2x的焦点,P点在抛物线上移动,若|PA|+|PF|取最小值,则点P的坐标是 (A)(0,0);(B)(1/2,1); (C)(1,1);(D)(2,2)。 4.方程y=|1-x~2|~1/2的图象是__。
1. Regardless of any real number of a, the curve represented by the equation x~2+2y~2sina=1 must not be __. (A) straight line; (B) circle; (C) parabola; (D) hyperbolic. 2. The curve C and the parabola y~2=4x-3 are symmetrical about the straight line y=x, and the equation of C is __. (A) x~2=4y-3; (B)y=4x~2-3; (C)x=3y~3-3; (D)x=1/4(y~2+3). 3. If the coordinate of point A is (3,2), F is the focus of parabola y~2=2x, point P moves on the parabola. If |PA|+|PF| takes the minimum value, the coordinate of point P is (A)(0,0);(B)(1/2,1);(C)(1,1);(D)(2,2). 4. The image of the equation y=|1-x~2|~1/2 is __.