解方程组: {3x+2y=13 3x-2y=5 {x-y/3=x+y/2+1 2x-5y=9
解方程组: {3x+2y=13 3x-2y=5 {x-y/3=x+y/2+1 2x-5y=9
解方程组{(x-2)(y+3)=(x+1)(y-1) {(x+1)(y+1)=(x-1)(y+5)
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
解二元一次方程组:{5(x+y)+3(x-y)=2{7(x+y)-3(x-y)=-6
换元法解方程组3/x+y+2/x-y=17/5 2/x+y-5/x-y=1
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
10/x+y+3/x-y=-5 15/x+y-2/x-y=-1(用换元法解此方程组)