已知x-y=1,求[(x+2y)2+(2x+y)(x-4y)-3(x+y)(x-y)]÷y的值.
已知y-2x=10,求[2y(x-y)-(x-y)2+(x+y)2-2xy]÷4y的值.
已知x-y=1,求[(x+2y)2+(2x+y)(x-4y)-3(x+y)(x-y)]÷y的值.
已知:3x=8y.求(1)x+y/y (2)2x+3y/x-2y
已知x=3分之1,y=二分之一,求代数式x-(x+y)+(x+2y)-(x+3y)+...-(x+13y)的值
已知x-y=1,y≠0,求{(x+2y)²+(2x+y)(x+4y)-3(x+y)(x-y)}÷y的值.
已知2x-y=10,求代数式[(x²+y²)-(x-y)²+2y(x-y)]÷4y的值?
已知x-y/x=x/x-2y(y不等于0),求x:y的值
(1)已知x+y=6,x²-y²=5,求x-y的值(2)若x+y=3,x²+y²
若|x+y-1|+(x-y-2)²=0,求代数式(x+2y)(x-2y)-(2x-y)(-y-2x)的值.
已知x(x+1)-(x2-y)=-3,求代数式[(x-2y)2+(x-2y)(x+2y)-2x(2x-y)]÷2x的值.
已知2x-y=10,求((x+y)-(x-y)+2y(x-y))÷4y的值
已知xy=2,x-y=3,求(x+y)(x-y)-y^2-(6x^2y-2xy^2)/2y的值.