3x+2y=5 5x-4y=1 方程组

解下列方程组:5x+y/2=2x-4y/3=x+1 方程组y=2x-4 y=-3/4x+1有几解方程组y=-2x+2 y=-2x+5有几解 1/2x-2y=-74,x-6y=-12解方程组,x／5-y／2=2,2x+3y=4解方程组 5x=3y x-y=4 写出方程组的过程 1/2X=-2/3y 2x+y=7 写出方程组过程 方程组x-2y=8,3x-4y=5,x=?,y=? 方程组4x+y=3 3x+2y=5,则x-y= 解方程组3x+5(x+y)=2 3y-2(x+y)=4 解下列方程组:x-2/3x-1=2y,2(x+y)-5x+y=－4 3(x-y)+5(x-y)=19 4(x+y)-2(x-y)=-1解方程组是3（x+y) 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{(x-2)(y+3)=(x+1)(y-1) {(x+1)(y+1)=(x-1)(y+5) 解方程组 X+Y/2+X-Y/3=6 4[X+Y]-5[X-Y]=2 解二元一次方程组{x+y/2+x-y/3=6,4(x+y)-2=5(x-y) 解方程组2分之x+y+3分之x-y=6 4(x+y)-5(x-y)=2 解方程组 {(x+y)/2+(x-y)/3=6 5(x+y)-2(x-y)=4 3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2 解方程组 x+y/2+x-y/3=6,4(x+y)-5(x-y)=2用加减消元法解方程组 解方程组 3(x+y)-2(x-y)=9,5(x+y)+2(x-y)=-1