3y/5+(y+4)/2.5=2.4y
(2y-3)(-y+4)=(y-2)(y-5)-3y(y-7/3)解方程
(5x+3y)(3y-5x)-(4x-y)(4y+x)=
解3y+5/3y-6=1/2+5y-4/2y-4
解方程:(y+4)/5+y+6=(y+8)/2-(y+4)/3
3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27
10y+2(7y-2)=5(4y+3)+3y怎么算
4x-2y-6y*-y-3x+5y* *=2 就是平方
微分方程(1)(y'')^2+5y'-y+x=0;(2)y''+5y'+4y^2-8x=0;(3)(3x+2y)dx+(
化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1
解方程 2y+5/3y-6-y/2=5y-4/2y-4
解方程:2y+5/3y-6 — y/2 = 5y-4/2y-4
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuai