(X+Y)Z=1 (1.2X+Y)9/10=1 (X+3/4Y)(Z+2.5)=1 方程组怎么解?只要求解出Z.

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)=? 1、y-x/x²-y²2、(x-y)(y-z)(z-x)/(z-y)(y-x)(x-z) {x+y-z=11 y+z-x=5 z+x-y=1 {x+y-z=11,x-y-z=-5,x-y+z=1 12y+9z=x,6(y+1/4)+9z=x,y+z=x x-y+2z=-1,2x+y-z=-1,3x-2y-2z=-9 x=2y-9z x+2y-3z=2 x-2y+6z=1 已知｛2x-y-z=0,3x-9y+z=0求1,x:y:z X/Y+Z=Y/X+Z+1=Z/X+Y-1=X+Y+Z,求x+y+z等于多少 计算x/y+x=y/x+z+1=z/x+y-1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 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 设正实数x,y,z满足x+2y+z=1,则1/(x+y)+9(x+y)/(y+z)的最小值 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)÷10=x+1.1 y+x=z-80+y-1 z-y=8x+y+8 x+z÷y=? x,y,z都>0.且x+y+z=1.求证1/x+4/x+9/z>=36 有谁能帮俺解释一下++x||++y&&++z是什么意思啊?main(){int x,y,z (x,y,z);x=y=z=1; ++x||++y&&++z; printf(x=%d,y=%d,z=%d ,x,y,z) } x+y+z=6 x+2y+3z=14 y+1=z