{3x-y=6 t+y=6}
已知{x=3t^4+6t,y=t^3-3t} 求导数
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20
{(x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=-20
4(x+y)-3(x-y)=-20,2/x+y+3/x-y=6
6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
{4/(x+y)+6/(x-y)=3 {9/(x-y)-1/(x+y)=1
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
已知{x=3t^2+1,y=t^6+2t^3},求导数
已知x,y,z,t,满足方程组x+y+z=6,2x-z+t=-2,y+z+t=4,x-2y+t=-4,求想,x,y,z,
已知xy=-2,x-y=3,求(x+y)(x-y)-y^2+(x-y)^2-(6x^2y-2xy^2)÷2y