2x-y=10 5x+6y=42解方程组

2x-y=10 5x+6y=42解方程组 解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7 解方程组,x+y/2=3x-2y=10+6x+y/4, x+y+xy=5 (x^2)y+x(y^2)=6 解方程组 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{x+y/2+x-y/3=6,4(x+y)-2=5(x-y) 解方程组2分之x+y+3分之x-y=6 4(x+y)-5(x-y)=2 解方程组 {(x+y)/2+(x-y)/3=6 5(x+y)-2(x-y)=4 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 3/(X-Y)+10/(X+Y)=-5 2/(X-Y)-15/(X+Y)=1 解分式方程组 解方程组6(x-y)-7(x+y)=21 2(x-y)-5(x+y)=-1 解方程组:{二分之x+y+二分之x-y=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)+2(x-y)=11,6(x+y)-5(x-y)=13. 解方程组：x+y/2+x-y/3=6,（x+y）+5（x-y）=38 谢. 解联立方程组 x/x+y=5/8 x/x+y+6=2/3 六年级三道关于方程的数学题. 解方程组{-x+2y+3z=12 {2x-2y+5z=13 {3x+2y+z=10 解方程组{2(x+y)-3(x-y)=1 {6(x+y)+7(x-y)=51 此题去括号,变简易方程组再做.已知方程组{2x-y=0 {2x+y=m 和方程组{x-y=5 {2x-y=n-1