3x+5y=8 5x+3y=8

(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuaihuajian （x+y-5)*（x+y-5)+（x-y+3)=0 x*x-y*y 已知:3x-5y=0,求x/y,x-y/y,x-y/x 3x-2y=9 x-3y=2 x+y=5 x+2y=3 y=x 2x+y=8 x+y=1 5x-2y=8 3x-y=7 2x-y=3x表示y和用y表示x 已知x.x+y.y-6x-8y+25=0,求3x.x+5y的值 {x+y=1 ,xy=-6{x(2x-3)=0,y=x²-1{(3x+4y-3)(3x+4y+3)=0,3x+2y=5{(x-y+2)(x+y)=0,x²+y²=8{(x+y)((x+y-1)=0,(x-y)(x-y-1)=0 7y=x+3,8y=x+5 7y=x+3,8y-5=x 7y=x+3,8y+5=x x+y=8,5x+3y=34; 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) (7y-3x)-(8y-5x)= 5X+8Y=3Y+6X x+y=5,2x+y=8,x-2y=0,3x+2y=8 填空题 x+y/4=x-y/6=3x+12y+5/8 x= y= 3(2X+Y)+(2(2x-Y)=6 (8X+4y)-(10X-5Y)=2 (4x-2y-z)-{5x-[8y-2z-(x-2y)]-x-(3y-10z)}=?