解x+y=17、y+2-x=-1、z+x-y=3

解x+y=17、y+2-x=-1、z+x-y=3 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)=? 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)/ (x+y-z)(x-y+z)= 用行列式的性质证明：y+z z+x x+y x y z x+y y+z z+x =2 z x y z+x x+y y+z y z x 这个怎么证? x-z=-4 z-2y=-1 x+y-z=-1 怎么解 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 解方程组:2x+y+z=15 x+2y+z=16 x+y+z=17 解方程 x+y+z=10,x+3y+2z=17,y-x+3z=8 解方程组 x+y+z=2 x-2y+z=-1 x+2y+3z=-1 解方程组：x-2y+z=-1,x+y+z=2,x+2y+3z=-1 解方程：x+z=y (1) ,7z-(x+y)=2 (2) ,x+y+z=14 (3) 解方程组 :X+Y-3Z=1 Y+Z-3X=2 Z+X-3Y=3 解方程组:x:y:z=1:2:3;x+y+z=12,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=1 x+z=2 z-y=17x-y=1(1)x+z=2(2) z-y=17(3) x+y=-2 x+z=13 y+z=1 解方程组x+y=-2x+z=13y+z=1解方程组