X=(Y+z+148)*1/3 Y=(X+Z+148)*1/5 Z=(X+Y+148)*1/6 这个三元一次方程式怎么解答出来?

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)=? 已知实数x y z满足x/(x+1)=y/(y+2)=z/(z+3)=(x+y+z)/3,求x+y+z的值 已知实数x y z满足x/(x+1)=y/(y+2)=z/(z+3)=(x+y+z)/3,求x+y+z的值 分式加减的几道题目求速度1 .(x+y)²/（x-z)(y-z) - (y+z)²/（x-z)(y-z) = 2.2x+3y/x-y+2y/y-x-3y/x-y= x+y+z=6 x+2y+3z=14 y+1=z (x+y-z)(x-y+z)= 已知(x+y)(x+z)=x,(y+z)(y+x)=2y,(z+x)(z+y)=3z,求x,y,z 试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y) 一条分式数学题已知x y z满足x/x+y + y/z+x + z/x+y =1,求x²/x+y + y²/z+x + z²/x+y的值.3Q 若|x+3|+|y-2|+|2×z+1|=0求(x×z-y×z)(y-x+z)的值 matlab解对数方程组[x,y,z]=solve('0.29744*x/(3+0.1*x+y+z)=(log10((3+x+y+z)/(3+0.1*x+y+z)))^2','0.79*x/(3+0.1*y+z)=(log10((3+x+y+z)/(3+0.1*x+y+z)*(3+y+z)/(3+0.1*y+z)))^2','1.25*x/(3+0.1*z)=(log10((3+x+y+z)/(3+0.1*x+y+z)*(3+y+z)/(3+0.*1y+z)*(3+z)/ 求X Y Z各代表什么数,使下列等式成立1、X+X+X=Y+Y；2、Y+Y+Y+Y=Z+Z+Z；3、X+Z+Y+Y=180 x+y-z=3 y+z-x=5 z+x-y=7 求x,y,z X+Y+Z=? 已知x+y+z=0求证x*x*x+y*y*y+z*z*z=3xyz 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 证明 ：x/(y+z)+y/(z+x)+z/(x+y)>=3/2其中 x,y,z>0 x/y=(x+z)/(y+z)y/z=(x+y)/(x+z)