600/(x+y)=15 600/(x-y)=60解方程组
解方程组x+y=15 (x+15%x+y+10%y)=17
解方程组(三分之x+y)+y=6,3(x+y)-y=24
解方程组:{x+|3x-y|+3y=15 2x+y=6
解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7
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
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(2x+9y=4.8 3x-5y=-15)
解方程组 x+2y=1.5,12(x+y)+15y=20
方程组x-y=500① x+15%-(y-10%y)=950②
解方程组(1/X+Y)-(1/Y-X)=8/15,(5/X+Y)-5/Y=4
解方程组(1)2x-3y=10,-4x+y=5 (2)3x-2y=15,5x-4y=23