x+5y=6 3x-6y=4

{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1 x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20 {(x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=-20 4(x+y)-3(x-y)=-20,2/x+y+3/x-y=6 6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5 ｛4/(x+y)+6/(x-y)=3 ｛9/(x-y)-1/(x+y)=1 4x-2y-6y*-y-3x+5y* *=2 就是平方 若5x+3y=3x+4y=x+2y+6,则x+y=___ x+y/2+x-y/3=6,4(x+y)-5(x-y)=2用加减消元法解方程组 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)=12 解方程组 X+Y/2+X-Y/3=6 4[X+Y]-5[X-Y]=2