Y=1/X X^2+Y^2=9 Y=|-2x| X=-3|sin y|
Y=1/X X^2+Y^2=9 Y=|-2x| X=-3|sin y|
高数 求导 1 Y=x+x^x 2 Y=sin(x+y
求导:x^2*y^2 + x sin(y) = 1
y =(cos^2) x - sin (3^x),求y'
y=1-x^2 x>=0 ,y=sin|x|/x x
先化简再求值(x-y)(x+y)-(x-2y) 的完全平方+x(3x-5y)-(x-y)(x-2y),其中x=1/2 y
已知X-Y/X+Y=3,求代数式2(x-y)/X+Y-3X+Y/X+Y
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
sin(x+y)sin(x-y)=k,求cos^2x-cos^2y
(3x-y)^2+(3x+y)(3x-y),x=1,y=-2
已知4x=9y求(1)x+y/y (2)y-x/2x
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1