解方程组:x+y=2x+y+1=5x+2y+1

解方程组{(x-2)(y+3)=(x+1)(y-1) {(x+1)(y+1)=(x-1)(y+5) 解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7 解二元一次方程组 x+y=3 1/2(x+y)-3y=5 解方程组｛ 3x-4y(x-y)=3 { 2x-3y=1 解方程组: ｛3x+2y=13 3x-2y=5 ｛x-y/3=x+y/2+1 2x-5y=9 解方程组：（0.2x+0.1y）/2- （4x-y）/10=（x-y）/5+ (3x+0.5y)/30 (3x+2y-1 要求 解方程组：｛(X-1)(Y+1)=(X+1)(Y+1)｛X(2+Y)-6=Y(X-4) 数学书解方程组{2(x+y)-(x-y)=3,（x+y)-2(x-y)=1 解方程组:(x+3)(y-2)=(x-3)(y+10),(x+1)(y+3)=(x-2)(y+12) 解方程组：2(x-y)/3-x+y/4=-1 ,6(x+y)-4(2x-y)=16 换元法解方程组3/x+y+2/x-y=17/5 2/x+y-5/x-y=1 2(x+y)-3(x-y)=1 6(x+y)+7(x-y)=51 解方程组