y=2x^2-3x+7,求y.y=cos(3x+1)求y
y =(cos^2) x - sin (3^x),求y'
Sin x-sin y=2/3 cos x-cos y=1/2 求cos(x-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)
求微分 y=ln(1-x^2) y=e^-x +cos(3+x) y=sin2x
sin(x+y)sin(x-y)=k,求cos^2x-cos^2y
已知:3x=8y.求(1)x+y/y (2)2x+3y/x-2y
若x、y满足2x+y=6,x-3y=1,求7y(x-3y)²-2(3y-x)³的值
已知x=1/3,y=-1/2,求代数式x-(x+y)+(x+2y)-(x+3y)+(x+4y)-(x+5y)+...-(
1奥数题x-2y/x+2y=3,求x-2y/3(x+2y)-3(x-2y)/x-2y的差
已知实数x.y满足根号(x+y-8)+根号(8-x-y)=根号(3x-y-4)+根号(x-2y+7),求x,y
求下列函数的导数:y=x-sin x/2 cos x/2 y=x^3+3^x