(-3y^3)^2*(1/3y)^3
解方程:3y^2-(2y+1)(y-1)=(y-5)(y+1)
解方程3y^2-(2y+1)(y-2)=(y-5)(y-1)
已知:3x=8y.求(1)x+y/y (2)2x+3y/x-2y
微分方程y''-3y'+2y=5,y(0)=1,y'(0)=2求解过程
已知7/3*根号(9y)-y-2y*1/y=-2,求y的值
1.5y+8y-6y=2y-3
解方程y-[3y-1]等于5【y+2]
因式分解 (1)6(x-y)^3-3y(y-x)^2 (2)x(x-y)(a-b)-y(y-x)(
1.((y+2x)(-2x+y)+4(x+2y)^2)/3y 2.(2(x-y)^3-8(x-y)^2(x+y)+6y(
1) (x+y)^2-(x+y)^3 2) (x-y)^2-(x-y)^3 3)(x-y)^2-(y-x)^3 因式分解
先化简再求值:(x-2y)²-(x+2y)(x-2y)-(x-3y)(x-y).其中x²+9y
已知y满足不等式(-y+1/2)-y>2+(y+2/3),化简/y+1/+/2y-1/=_____ 急!