y^2-6y-2÷2y-4=

(y^2)^4y-(-2y)^3y^6= y^2-6y-2÷2y-4= 6y-(y+2分之y+2-y分之y)÷(y^3-4y-2y^2+8分之y) 怎么算 2y+5/3y-6-y/2=5y-4/2y-4 先化简,在求值：6y-(y+2分之y + 2-y分之y)除以y³-4y-2y²+8分之y,其中y= -2分之5先化简,在求值：6y-(y+2分之y + 2-y分之y)除以y³-4y-2y²+8分之y,其中y= -2分之5 [(x+y)(x-y)-(x-y)²+2y(x-y)]÷4y 数学题=y(y+3)-4(y+3)2=(y+3)(y-4y-12) 2-（4-y)=6y-2（y+1) 2-(4-y)=6y-2(y+1) y^-6y-2;2y-4=多少? y(5y-2)=6-4y 解方程 解方程 4y-2=y-6+7y 2x-y=2,求[(x²+y²)-(x-y)²+2y(x-y)]÷4y |2y-6|=9+4y 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 常微分方程的通解dy/dx=(x-y+1)/(x+y-3)y^4=2y^n+y=0y''+6y'+9y=e^(-3x)y''+y'-2y=4e^(2x) (y-2)(y^2-6y-9)-y(y^2-2y-15),其中y=1/2.先化简再求值. y (3y^2+8y-3)-6y(3y+2y-1)+9y