已知函数 f 1 ( x )= , f 2 ( x )= x +2, (1)设 y = f ( x )= ,试画出 y = f ( x )的图像并求 y = f ( x )的曲线绕 x 轴旋转一所得几何体的表面积; (2)若方程 f 1 ( x + a )= f 2 ( x )有两个不等的,求实数 a 的范围. (3)若 f 1 ( x )> f 2 ( x - b )的为[-1, ],求 b 的值.
【简答题】用恰当的形式填空 a. The tiger ___very strong.(be) b. We ____ busy all the time.(be) c. Shanghai ____ in the east of China.(lie) d. He ____in a French’s college.(work) e. Catherine ____ English every day.(stud...
【简答题】用恰当的形式填空 a. The tiger ___rather strong.(be) b. We ____ busy all the time.(be) c. Shanghai ____ in the east of China.(lie) d. He ____in a French’s house.(work) e. Catherine ____ English every day.(stud...