二道方程组(1){3x=2y=-1{x+4y=7(2){3x-2y=5{4x+3y=1
解方程组{ 3x-4y(x-y)=3 { 2x-3y=1
解方程组:2(x-y)/3-x+y/4=-1 ,6(x+y)-4(2x-y)=16
一道二元一次方程组!3(x+y)-4(x-y)=4,(x+y)/2+(x-y)/6=1
解二元一次方程组{3(x+y)-4(x-y)=4,x+y/2+x-y/6=1
解方程组3(x+y)-4(x-y)=4和(x+y)/2+(x-y)/6=1
解二元一次方程组{3(x+y)-(x-y)=4,x+y/2+x-y/6=1
解二元一次方程组:3(x+y)-4(x-y)=4,x+y/2+x-y/6+1
解方程组一{2x-5y=1,5x+2y=17 二{x+y/2=6-x-y/3,4(x+y)-5(x-y)=2
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-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
2(x+y)-3(x-y)=1 6(x+y)+7(x-y)=51 解方程组