若2^x=3^y=5^z>1,比较2x,3y,5z的大小我没还没学对数不会用log

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. 设x.y.z满足3x=4y=6z（x.y.z都是指数）求证1/z-1/x=1/2y(2）比较3x.4y.6z的大小 若|x+3|+|y-2|+|2×z+1|=0求(x×z-y×z)(y-x+z)的值 若x,y,z是3个不相等的非零实数,且x+1/y=y+1/z=z+1/x.求证x^2Y^2Z^2=1(题目比较难! 若2^x=3^y=5^z>1,比较2x,3y,5z的大小我没还没学对数不会用log 若2^X=3^y=5^Z＞1试比较2x,3y,5z的大小,幷证明你的结论 2^x=3^y=5^z.x,y,z属于R,比较2x.3y,5z的大小? 已知实数X,Y,Z,满足X^2-2X+Y=Z-1,且X+Y^2+1=0,试比较X,Y,Z的大小. 若x+y+z=3y=2z,则x/x+y+z=? x/2=y/3=z/5 x+3y-z/x-3y+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 若X:Y:Z=5:6:7那么(Y-X):(Y+Z)和(X+2Y+3Z):(3X+2Y+Z) 方程组 (1) x+2y-3z=12 x-3y+2z= - 13 x-y-z=0 (2) x+ y=z 5x-y+z=18 2x+5y+3z= -1 x+Y+Z=1 X+3Y+7Z=-1 X+5Y+8Z=2x+Y+Z=1X+3Y+7Z=-1X+5Y+8Z=2 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 已知x-y/x+y=y+z/2(y-z)=z+x/3(z-x),求证8x+9y+5z=0THX..