（5+1）x=5y x-y/3=x+y/2 这两个方程组怎么写 4y-4x=30+10 2x-5y=7

解方程组：（0.2x+0.1y）/2- （4x-y）/10=（x-y）/5+ (3x+0.5y)/30 (3x+2y-1 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=? 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+y/2+x-y/3=6 4(x+y)-5(x-y)=12 解方程组 {3(x+y)-4(x-y)=11 {2(x-y)+5(x+y)=27全过程、快 解方程组 {3(x+y)-4(x-y)=11 {2(x-y)+5(x+y)=27 y-3x=2,y-5x=4,y-7x=6,y-9x=8,y-11x=0方程组,