x=1.96 ,y=2.56求x-2√xy+y/√x-√y

x=1.96 ,y=2.56求x-2√xy+y/√x-√y x=1.96 ,y=2.56求x-2√xy+y/√x-√y 求y=(x^2)+2x(x≥0) y=-x+2x(x 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) y=arcsin(x/√1+x^2),求y' y=ln(x+√x^2+1),求y 已知y=√(x-8)+√(8-x)+18,求代数式 (x+y)/(√x-√y)-2xy/(x√x-y√x) 的值 Y=X^2X (X>0) 求导Y=X^2X (X>0) 求d(Y)/d(X) 已知x+y=a,2x-y=-2a,求[（x/y-y/x)/(x+y)-x(1/x-1/y)]/[(x+1)/y]的值 若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值 y=x^x^x求导数 求微分 y=x^(x^2) y=x^2x,求dy x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 如果|X|=4 |Y|=2 且|X+Y|=X+Y 求X+Y 已知|x|=2,|y|=3,|x+y|=-(x+y)求x-y x+2y=2x+y+1=7x-y 求：2x-y? x^2+y^2=15,x+y=7,x＞y,求x-y