用换元法解方程组3/(2x+y)-x+2y=-1/2,5/(4x+2y)+x-2y=-21/2
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(x+y)(x-2y)=-5 (x-y)(x+2y)=7
方程组x-2y=8,3x-4y=5,x=?,y=?
解方程组{ 3x-4y(x-y)=3 { 2x-3y=1
换元法解方程组3/x+y+2/x-y=17/5 2/x+y-5/x-y=1
解方程组:2(x-y)/3-x+y/4=-1 ,6(x+y)-4(2x-y)=16
x+y/2+x-y/3=6,4(x+y)-5(x-y)=2用加减消元法解方程组
3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2 解方程组
解方程组 {(x+y)/2+(x-y)/3=6 5(x+y)-2(x-y)=4
解方程组 X+Y/2+X-Y/3=6 4[X+Y]-5[X-Y]=2
解方程组{(x-2)(y+3)=(x+1)(y-1) {(x+1)(y+1)=(x-1)(y+5)
一道二元一次方程组!3(x+y)-4(x-y)=4,(x+y)/2+(x-y)/6=1