解方程组2x-5y=7 3x+4y=17
解方程组2x-5y=7 3x+4y=17
解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7
解二元一次方程组:{5(x+y)+3(x-y)=2{7(x+y)-3(x-y)=-6
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
解方程组x/4+Y/4=2,x/6+y/3=2; X+2Y=1,2X-3Y=2; 4X-3Y=17,5X+Y=7
解方程组:2x-3y=9(1),7x+4y=17(2)
解方程组 3x-5y=7 4x+2y=5