解方程组 2x+y＝5 x-y=4

解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7 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:{二分之x+y+二分之x-y=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 1/2x-2y=-74,x-6y=-12解方程组,x／5-y／2=2,2x+3y=4解方程组 {2分之x+y+3分之x-y＝6 4(x+y)-5(x-y)=2方程组的解要有过程 2分之x+y+3分之x-y＝6 4(x+y)-5(x-y)=2方程组的解要有过程 关于X,Y的方程组3X+2Y=2m+5与x-y=4m-5的解x,y满足x+2y