7x+3y=4 5x-4y=9解方程组

7x+3y=4 5x-4y=9解方程组 方程组3x+7y=9 4x-7y=5的解是 方程组3x+7y=9,4x-7y=5的解 解方程组8x+5y=-9 4x+3y=-7 y-3x=2,y-5x=4,y-7x=6,y-9x=8,y-11x=0方程组, 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} 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)=12 解方程组 {3(x+y)-4(x-y)=11 {2(x-y)+5(x+y)=27全过程、快