(3-y)÷2+y=(7y-6)÷8.求过程啊

(3-y)÷2+y=(7y-6)÷8.求过程啊 已知xy=-2,x-y=3,求（x+y)（x-y)-y^2+（x-y)^2-（6x^2y-2xy^2)÷2y (y+2)÷4-(2y-3)÷6=1 求y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：2x+y=6,x-3y=1 求7y(x-3y)(x-3y)-2(3y-x)(3y-x) 2x-y=2,求[(x²+y²)-(x-y)²+2y(x-y)]÷4y 计算：(x-y)^7÷(y-x)^6+(-x-y)^3÷(x+y)^2 计算(x-y)^7÷(y-x)^6+9-x-y)^3÷(x+y)^2 已知x^2+4y^2-4x+4y+5=0,求(2x^2+xy-y^2分之x^4-y^4)乘以（xy-y^2分之2x-y)÷（y分之x^2+y^2)^2的值已知xyz≠0,x+3y+7z=0,3x-4y-18z=0,求(x^2+2y^2+8z^2)分之（3x^2+5y^2+6z^2)的值 6y-(y+2分之y+2-y分之y)÷(y^3-4y-2y^2+8分之y) 怎么算 (x+y)(x-y)+(x-y)^2-(6x^2×y÷2y-2xy^2÷2y)其中x=-3,y=1/3 求[(x²+y²)-(x-y)²+2y(x-y)]÷4y的值,其中2x-y=8. 若x、y满足2x+y=6,x-3y=1,求7y(x-3y)²-2(3y-x)³的值 已知xy=-2,x-y=3,求(x+y)(x-y)-y²+(x-y)²-(6x²y-2xy²)÷(2y)的值. 已知2x-y=10,求式子[(x^2+y^2)-(x-y)^2+2y(x-y)]/4y (4xy-2y²)/4y是怎么变成=2y(2x-y)÷4y 求方程 8y-3(3y-2)68y-3(3y-2)=6 解方程4y-3(20-y)=6y-7(11-y)求过程 4（5—2y)+7(y+1)=3(4y-1)+17求y