2x-3y=8,3x+7y=0.5快解
解方程组 {3(x+y)-4(x-y)=11 {2(x-y)+5(x+y)=27全过程、快
解二元一次方程(x+8)/y=x/3-1 2/7-y-x/2=2 快
已知x-y/x+y=2,求代数式2(x-y)/x+y + x+y/3(x-y)的值 快啊.
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
x-5y=8 2x-3y=9二元一次方程 快呀
已知实数x.y满足根号(x+y-8)+根号(8-x-y)=根号(3x-y-4)+根号(x-2y+7),求x,y
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
求解三元一次方程,快.3x+y+2z=8 x+y+z=5 2x+3y+4z=7
2x-y=7,3x+y=8
2x -3y=7,4x+5y=3用二元一次方程组解.快
解方程组24/(x+y) +24/(x-y) = 7/3 ,8/(x+y) +18/(x-y) = 4/3
解二元一次方程组:{5(x+y)+3(x-y)=2{7(x+y)-3(x-y)=-6