用加减消元法解x=2y-1 2x+y=-7 也用加减法解3x=5y 4y-3x+9=0

用加减消元法解方程组3x-2y=1 2x+3y=-7 用加减消元法解方程组 3(x-1)=y+5 2(y+1)=x+1 ｛x/3+y/4=1 x/3-y/2=1 用加减消元法解方程组 用加减消元法解这个方程组x=2y-1①x+y=200② {x/2+y/3=1,x+y=3,用加减消元法解 {4x-3y=5,2y-4x=1用加减消元法解 {4x-3y=5,2y-4x=1用加减消元法解 x+y/2+x-y/3=6,4(x+y)-5(x-y)=2用加减消元法解方程组 3x+2y=1,4x-2y=13 用加减消元法解 求x与y 3x+2y=1,4x-2y=13 用加减消元法解 求x与y {x-y=3 2x+3(x-y)=11 用加减消元法解方程组 ｛x-y=3 2x+3(x-y)=11 用加减消元法解方程组 用加减消元法解二元一次方程组：①[(x+y)/2]+[(x-y)/3]=5②[(x+y)/2]+[(x-y)/3]=-1 具体一点! 方程组 x/2-2y=1/2,x+y/2=-9 怎样用加减消元法解? 3x+2y=9 3x-2y=3 用加减消元法解方程组 2x=-3y=4x-2-y+10,用加减消元法解方程组 用加减消元法解方程组{x/3+y/4=2 x/4+y/3=2 用加减消元法解方程组｛2X+3Y=8.7｛4X+2Y=12.2