8y+12=8-8y-5y+10
10y+2(7y-2)=5(4y+3)+3y怎么算
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuai
已知x+y=10,求[(x+y)^2-(x-y)^2-2y(x-y)]÷5y的值
y满足x-y+2≥0,x+y-4≥0,2x-y-5≤0 求X^2+Y^2-10Y+25的最小值
化简(x+y)-(2x+y/2)-(3x+y/6)-(4x+y/12)-(5x+y/20)-……-(10x+y/90)
[-(x-y)^2/xy]^-4*(y^2-xy/x)^3*(x^4/y^10)÷(xy-y^2/x)^-5=-y(y-
(7x-10y)-(-10y-5x)=?
5(2x-7y)-(4x-10y)全过程
5(x-y)'3+10(y-x)'2;
分式化简 xy-5y/10y+2xy
10a(x-y)²-5a(y-x) 因式分解