方程组 x+y=5,x-3y=1,x-y+2z=4的解是

方程组x²-y²-3x+5y=0,x-y-1=0 解方程组:{x+y=3,x-y=5 解方程组{(x-2)(y+3)=(x+1)(y-1) {(x+1)(y+1)=(x-1)(y+5) 换元法解方程组3/x+y+2/x-y=17/5 2/x+y-5/x-y=1 10/x+y+3/x-y=-5 15/x+y-2/x-y=-1（用换元法解此方程组） 解方程组 3(x+y)-2(x-y)=9,5(x+y)+2(x-y)=-1 3/(X-Y)+10/(X+Y)=-5 2/(X-Y)-15/(X+Y)=1 解分式方程组 解方程组:{3(x+y)-2(x-y)=9,5(x+y)+2(x-y)=-1} 二元一次方程组 2(X+Y)-(X-Y)=3 (X+Y)-2(X-Y)=1 解方程组二元一次方程组 2(X+Y)-(X-Y)=3 (X+Y)-2(X-Y)=1 解二元一次方程组 x+y=3 1/2(x+y)-3y=5 解方程组x+y（y加绝对值）=-1,3x-5y=-11 X-Y=3(y-2),2(x-1)=5Y-18解下列方程组 解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7 解方程组: ｛3x+2y=13 3x-2y=5 ｛x-y/3=x+y/2+1 2x-5y=9 ①7x-3y=1,②-5x+6y,方程组①7x-3y=1,②-5x+6y求x,y 3(x-y)+5(x-y)=19 4(x+y)-2(x-y)=-1解方程组是3（x+y) 解下列方程组:x-2/3x-1=2y,2(x+y)-5x+y=－4 方程组x-2y=8,3x-4y=5,x=?,y=?