1/6x-4y + 1/6x+4y - 3x/9x^2-4y^2=过程=?
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
{4/(x+y)+6/(x-y)=3 {9/(x-y)-1/(x+y)=1
解方程:3x+2y/4=2x+y/5=x-y+1/6要详细过程
x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20
{(x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=-20
4(x+y)-3(x-y)=-20,2/x+y+3/x-y=6
已知4x=9y求(1)x+y/y (2)y-x/2x
若2x-3y+4=0则x(x*x-1)+x(5-x*x)-6y+7
化简求值:(7x-2y)(3x-2y-1)-(4x+3y)(9x+6y),其中x=2,y=-1
9y=3x-(x-1),4(x+y)-(2x+4)=8y
求方程组2(x-y)/3-x+y/4=-1 6(x+y)-4(2x-y)=16解答过程
3分之2(X-Y)-4分之X+Y=-1,6(X+Y)-4(2X-Y)=16