10y+x+45=10x+y 怎么样才能化简成为x-y=5
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuai
化简求值[2x(2y-1)]*[2x+(2y-10]-(4y+x)(4x-y),其中x=2,y=-1
已知/x/+x+y=10,/y/+x-y=12.求x+y的值
已知2x-y=10,求[(x²+y²)-(x-y)²+2y(x-y)]/4y
X+Y=7(100X+Y)-(10Y+X)=(10Y+X)-(10X+Y)
已知实数x,y满足|x|+x+y=10、x+|y|-y=12,则x+y的值?
(7x-10y)-(-10y-5x)=?
化简求值(x+2y)^2-(2x+y)(2x-y)-5y(y-x) 其中 x=1/3 y= -1/2
x+y=5; x^y+y^x=17
{ x-y/7-x+y/10=1/2 {2(x-y)+5(x+y)=3
已知x,y满足约束条件{2x+5y>=10,2x-3y>=-6,2x+y
解方程组:2/(x+y)+5/(x-y)=18 9/(x+y)-10/(y-x)=66