{3X=4Y 4X-5Y=2怎么解

5x+4y=22 4x+y=3y+x 怎么解 3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27 这题怎么解?X-Y=4,2X+Y=20,X=?Y=?3X+2Y=14,2X-3Y=5,X=?Y=? 化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1 3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2 解方程组 解方程x+y+(x+y/2)=15 3x+5y+4(x+y/2)=62 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 求5x-2y=x-y=4x-3y-2的解