1/2(3y-1)-1/5y<y+1急!
1/2(3y-1)-1/5y<y+1急!
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)
急!急!两道高数题!xy"+y'^2=y'求其通解;y"=(1+y')^3/2求:当y"|(x=0)=0,y'|(x=0
解方程y-[3y-1]等于5【y+2]
已知y满足不等式(-y+1/2)-y>2+(y+2/3),化简/y+1/+/2y-1/=_____ 急!
解3y+5/3y-6=1/2+5y-4/2y-4
(x+2)(x+3) (x-4)(x+1) (y+4)(y-2) (y-5)(y-3)
因式分解 x²-y²-1+2y急
化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1
微分方程(1)(y'')^2+5y'-y+x=0;(2)y''+5y'+4y^2-8x=0;(3)(3x+2y)dx+(
先化简再求值(x-y)(x+y)-(x-2y) 的完全平方+x(3x-5y)-(x-y)(x-2y),其中x=1/2 y