解方程组 40(X+Y)=400 200(X-Y)=400
解方程组(三分之x+y)+y=6,3(x+y)-y=24
解方程组x+y=15 (x+15%x+y+10%y)=17
解方程组 30x=4/5y 40(x-1)=y+25
解方程组:(0.2x+0.1y)/2- (4x-y)/10=(x-y)/5+ (3x+0.5y)/30 (3x+2y-1
解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7
解方程组{(x+2)^2-(y-3)^2=(x+y)(x-y) {x-3y=2 解方程组{3x+2y=7 {2x+3y=
解方程组(1)2x+3y=12 ,2x+y=0 (2)x+y=7,3(x+y)-7y=7
解方程组 2x+y=(4x-y-1)/2=(10+6x+2y)/4
解方程组{x-2y=6,(x+2y)*(2x-4y)=192
解方程组:4(x+1)=3(y+3) x-2y=7y-6x/3
解方程组(3x+2y)/4=x+3/4y=3(x-2)+y
解方程组 x-5y=0 { (x,y为正整数) 3X+2y=17