1:X+Y+Z=1002:80X+50Y+65Z=57203:X-Z=0求X,Y,Z

1:X+Y+Z=1002:80X+50Y+65Z=57203:X-Z=0求X,Y,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)=? (x+y+z)÷10=x+1.1 y+x=z-80+y-1 z-y=8x+y+8 x+z÷y=? (x+y-z)(x-y+z)= 解三元一次方程组 x+y+z=50,1/4(x+z)=y,x=y+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 X+Y+Z=? x/y=(x+z)/(y+z)y/z=(x+y)/(x+z) 1、y-x/x²-y²2、(x-y)(y-z)(z-x)/(z-y)(y-x)(x-z) X/Y+Z=Y/X+Z+1=Z/X+Y-1=X+Y+Z,求x+y+z等于多少 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 计算x/y+x=y/x+z+1=z/x+y-1的值 (y+z)/x=(z+x)/y=(x+y)/z求x+y-z/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= z+=x>y?++x: 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) }