x-y=5 2x+3y-15=0解方程组
解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7
解方程组:{x+|3x-y|+3y=15 2x+y=6
已知关于x、y 的方程组x-y=a+3与2X+Y=5的解x、y满足x>0,y
解方程组:2(x+y)-3(x-y)=34(x+y)+3x=15+3y.
解方程组 10(x-y)=3(x+y)+15 6(x+y)=4(2x-y)+16
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
10/x+y+3/x-y=-5 15/x+y-2/x-y=-1(用换元法解此方程组)
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