2x-5y=-3,-4x+y=-3用加减法解下列方程组

x+y/2+x-y/3=6,4(x+y)-5(x-y)=2用加减消元法解方程组 用加减消元法解方程组{4x-5y=5,2x+3y=-25 {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 5x-3y=2,4y+2x=6用加减消元法 5X+4Y=140,3X+2Y=76用加减消元法求解 2x-5y=-21 4x+3y+23 用加减消元法解 (3x+2y)/4=(2x+y+2)/5=-(x+5y)/3 用加减消元法 用加减消元法解方程组{x/3+y/4=2 x/4+y/3=2 2x+3y=3 3x+5y=4加减消 用加减消元法解方程：｛3x-3y=-6,3x+2y=4; 用加减消元法解：4x—3y=14 5x+3y=31 用加减消元法解方程组{3x+2y=5 2x-3y=8 用加减消元法算 {3x-2y= -12 ,2x+3y=5 {2X-3Y=5{2Y-5X+4=0加减消元! ｛6x-5y=8 3x-4y=5 用加减消元法做 6x-4y=37 3x+4y=-5 用加减消元法解方程组 ｛x/3+y/4=1 x/3-y/2=1 用加减消元法解方程组