解方程组{4x-7y=6 x -7y=-9
解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7
解方程组 x+y+z=-7 x-y=12 x+y-z=6
y-3x=2,y-5x=4,y-7x=6,y-9x=8,y-11x=0方程组,
2(x+y)-3(x-y)=1 6(x+y)+7(x-y)=51 解方程组
解二元一次方程组:{5(x+y)+3(x-y)=2{7(x+y)-3(x-y)=-6
解方程组﹛2(x+y)-3(x-y)=1 6(x+y)+7(x-y)=51
解方程组24/(x+y) +24/(x-y) = 7/3 ,8/(x+y) +18/(x-y) = 4/3
解方程组{4/x+y+6/x-y=3, 9/x-y-1/x+y=1
解方程组:{4/x+y+6/x-y=3 9/x-y-1/x+y=1}
解方程组:4(x+1)=3(y+3) x-2y=7y-6x/3
方程组3x+7y=9 4x-7y=5的解是
方程组3x+7y=9,4x-7y=5的解