x+y=20 x-y=4 z-x+y=10

已知 x/(y+z)+y/(z+x)+z/(x+y)=1求 (x*x)/(y+z)+(y*y)/(x+z)+(z*z)/(x+y)=? (x+y-z)(x-y+z)= x:y=3:4 y:z=2:1 x+y+z=20 急! X+Y+Z=? x/y=(x+z)/(y+z)y/z=(x+y)/(x+z) z+=x>y?++x: (y+z)/x=(z+x)/y=(x+y)/z求x+y-z/x+y+z的值 x=y; y=z; z=x/y x+y/2=z+x/3=y+z/4 x+y+z=27 x-4y+z=-302x+y-z=18x--y-z=7 {x+y-z=11 y+z-x=5 z+x-y=1 {x+y-z=11,x-y-z=-5,x-y+z=1 14x+4y+z=200,x+y+z=100求解x,y,z x+2y=3x+2z=4y+z 求x:y:z 若x,y,z成等差数列,则(z-x)^2-4(x-y)(y-z)= (x*x+2)(y*y+4)(z*z+8)=64xyz,求x,y,z x>=y>=z c语言x=3;y=z=4z>=y>=x 这个不是应该等于（z>y&&y=x)||(z>y&&y>x)||(z=y&&y>x)||(z=y&&y=x)这个难道不是1么 符合z=y&&y>x 计算x/y+x=y/x+z+1=z/x+y-1的值