解方程组 2X-5y=1 5X+2y=1

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 3(x+y)-2(x-y)=9,5(x+y)+2(x-y)=-1 解方程组:{3(x+y)-2(x-y)=9,5(x+y)+2(x-y)=-1} 解方程组6(x-y)-7(x+y)=21 2(x-y)-5(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 2x-y=5 2y/x-x/y=12x-y=52y/x-x/y=1 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：{3|x|-2y=8 2|x|+5y-1}解方程组：3|x|-2y=8 2|x|+5y-1 解方程组{x+y=8,5x-2(x+y)=-1 1/2x-2y=-74,x-6y=-12解方程组,x／5-y／2=2,2x+3y=4解方程组 解方程组: ｛3x+2y=13 3x-2y=5 ｛x-y/3=x+y/2+1 2x-5y=9 3(x-y)+5(x-y)=19 4(x+y)-2(x-y)=-1解方程组是3（x+y) 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） 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 解方程组：x/3+y/5=1 3(x+y)+2(x-3y)解方程组：x/3+y/5=1 3(x+y)+2(x-3y)=45