1、若|x+3|+|2-y|+|z+1|=0 求z-y-z的值 2、若|x+3|-|2-y|+|z+1|=0 求x-y-z的值

若|x+3|+|y-2|+|2×z+1|=0求(x×z-y×z)(y-x+z)的值 若xyz=1,求证 x^2/(y+z)+y^2/(z+x)+z^2/(x+y)≥3/2 若x:y:z=3:2:1,则x+2y-z/2x-y+z= 已知x:：y：z=3：4：5,(1)求x+y分之z的值；（2）若x+y+z=6,求x,y,z. 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 求解一道数学题若x+y+z+3=2(根号x+根号y+1+根号z-1),求（x+y+z)的（y-z）次方 若x+y+z+3=2(根号x+根号y+1+根号z-1）求（x+y+z）y-z x+y+z=6 x+2y+3z=14 y+1=z 1、y-x/x²-y²2、(x-y)(y-z)(z-x)/(z-y)(y-x)(x-z) 若|x-3|+|y+2|+|2z+1|=0,求(xy-yz)(y-x+z) 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)/ 三元一次方程组题目x+y-z=11 y+z-x=5 x-y+z=1x+y=4 y+z=3 x+z=5若已知x-3y+2z=0 2x+3y-8z=0, 且xyz≠0,则x:y:z= {x+y+z=1;x+3y+7z=-1;z+5y+8z=-2 如果,根号x-3+| y-2 |+z^2=2z-1 求 （x+z)^y 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= 设x,y.z为实数,2x.3y.4z是等比数列,1/x,1/y.1/z是等差数列,则(x/z)+(z/x)是多少? 若x:y=2:3,y:z=1:2,且x+y+z=55,则y=?