5x+14=y,7x+4=y
{3x-2y=3,2x+2y=17 {4x-2y=14,5x+y=7 {x+3y=6,2x-3y=3 {2x+3y=11
6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5
解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7
(5x+3y)(3y-5x)-(4x-y)(4y+x)=
3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27
已知:4x = 5y,求(x+y) :y
方程2分之x+y+2分之x-y=7,4(x+y)-5(x-y)=2
x-y+5x-4x= ?
已知x*x+4x+y*y-2y+5=0,则x*x+y*y=?
探究方程组{2x+5y=7 4x+10y=14{4x+10y=10 2x+5y=7{2x+5y=7 4x+6y=10
1、3x+y=22 2、3x-2y=9 3、4x+3y=25 4、2y=7x+3 5、4x-3y=14 5-2y=0 x
化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1