方程组2x+y=☆ 2x—y=12 解x=5,y=* 问☆= *=
解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7
解方程组:x+y/2+x-y/3=6 4(x+y)-5(x-y)=12
解方程组:(x+3)(y-2)=(x-3)(y+10),(x+1)(y+3)=(x-2)(y+12)
3(x+y)—4(x-y)=4,(x+y/2)+(x-y/6)=1.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:{二分之x+y+二分之x-y=6,4(x+y)-5(x-y)=2()
解二元一次方程组:{5(x+y)+3(x-y)=2{7(x+y)-3(x-y)=-6
解方程组:2/(x+y)+5/(x-y)=18 9/(x+y)-10/(y-x)=66
解方程组:2/(x+y)+5/(x-y)=18 9/(x+y)-10/(y-x)=66
解方程组 {3(x+y)-4(x-y)=11 {2(x-y)+5(x+y)=27全过程、快