[题目]椭球面s是椭圆 dfrac ({x)^2}(4)+dfrac ({y)^2}(3)=1 绕x轴旋转而-|||-成,圆锥面s2是过点(4,0)且与椭圆 dfrac ({x)^2}(4)+dfrac ({y)^2}(3)=1 相切的-|||-直线绕x轴旋转而成.-|||-(1)求s1及s2的方程-|||-(Ⅱ)求s1与s2之间的立体体积.

求椭球面dfrac ({x)^2}(2)+dfrac ({y)^2}(3)+dfrac ({z)^2}(4)=1上点dfrac ({x)^2}(2)+dfrac

[题目]-|||-椭圆 dfrac ({x)^2}(3)+dfrac ({y)^2}(4)=1 的离心率是 __

设l为椭圆dfrac ({x)^2}(4)+dfrac ({y)^2}(3)=1，其周长记为a，则dfrac ({x)^2}(4)+dfrac ({y)^2}(

[题目]求椭圆 dfrac ({x)^2}(4)+dfrac ({y)^2}(9)=1 在点 (1,dfrac (3sqrt {3)}(2)) 处的法线方-||

dfrac (1)(2)(S)_(8)^2-+(e)^-arrow (S)_(4)^2- (Na)^++dfrac (x)(4)(S)_(4)^2-+2(1-d

下列选项中曲面dfrac ({x)^2}(4)+dfrac ({y)^2}(1)+dfrac ({z)^2}(9)=3上点dfrac ({x)^2}(4)+df

设L为椭圆dfrac ({x)^2}(2)+dfrac ({y)^2}(3)=1，其周长为a，则dfrac ({x)^2}(2)+dfrac ({y)^2}(3

设C是椭圆 dfrac ({x)^2}(3)+dfrac ({y)^2}(2)=1, 其周长为L,设C是椭圆 dfrac ({x)^2}(3)+dfrac ({

[题目]合并同类项.-|||-(1) (x)^2y-2xy-4x(y)^2+xy+4(x)^2y-3x(y)^2;-|||-(2) dfrac (1)(5)(x

设 L 是抛物线=dfrac (1)(4)(x)^2上 点=dfrac (1)(4)(x)^2与 点=dfrac (1)(4)(x)^2 的一段弧则=dfrac