已知d)已知x:y=2:3,z:y=1:4求x:y:z最简整数比

已知(x+y)(x+z)=x,(y+z)(y+x)=2y,(z+x)(z+y)=3z,求x,y,z已知(x+y)(x+z)=x,(y+z)(y+x)=2y,(z+x)(z+y)=3z,求x,y,z已知(x+y)(x+z)=x,(y+z)(y

已知x+y:z=y+z:x=z+x:y,求（x+y)(y+z)(z+x):xyz的值已知x^2-3xy-4y^2=0且xy不等于0,求x:y的值.已知x+y:z=y+z:x=z+x:y,求（x+y)(y+z)(z+x):xyz的值已知x^2

已知X：Y=0.3：1/2,Y：Z=2：3,求X：Y：Z已知X：Y=0.3：1/2,Y：Z=2：3,求X：Y：Z 已知X：Y=0.3：1/2,Y：Z=2：3,求X：Y：Zx:y=3:5=6:10y:z=2:3=10:15x:y:z

已知：4x-5y+2z=0x+4y-3z=0则：(x*x+y*y+z*z)/(x*y+y*z+z*x)=____.已知：4x-5y+2z=0x+4y-3z=0则：(x*x+y*y+z*z)/(x*y+y*z+z*x)=____.已知：4x-

已知实数xyz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xyz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xyz满足x/(x+1)=y

已知实数xyz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xyz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xyz满足x/(x+1)=y

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)=?已知x/(y+z)+y/(z+x)+z/(x+y)=1求(x*x)/(y+z)+(y*y)/(x+z)+(z*

已知实数xyz满足x/y+z+y/z+x+z/x+y=1求x^2/y+z+y^2/z+x+z^2/x+y的值纠正下！：已知实数xyz满足（x/y+z）+（y/z+x）+（z/x+y）=1求（x^2/y+z）+（y^2/z+x）+（z^2/x

已知（1）X-Y+Z=0(2)X+2Y-3Z=0求X:Y:Z已知（1）X-Y+Z=0(2)X+2Y-3Z=0求X:Y:Z已知（1）X-Y+Z=0(2)X+2Y-3Z=0求X:Y:Z（1）-（2）：4Z-3Y=0,推出Y：Z=4:3（1）*2

已知{x：y：z=1：2：3,x+y+z=12,求x、y、z的值已知{x：y：z=1：2：3,x+y+z=12,求x、y、z的值已知{x：y：z=1：2：3,x+y+z=12,求x、y、z的值x：y：z=1：2：3,x=k,y=2k,z=3

已知｛2x-y-z=0,3x-9y+z=0求1,x:y:z已知｛2x-y-z=0,3x-9y+z=0求1,x:y:z已知｛2x-y-z=0,3x-9y+z=0求1,x:y:z2x-y=z3x-9y=-z18x-9y=9z3x-9y=-z15

已知x:y:z=1:2:3,x+y+z=24,求x,y,z已知x:y:z=1:2:3,x+y+z=24,求x,y,z已知x:y:z=1:2:3,x+y+z=24,求x,y,z解∵x：y：z=1:2:3∴x=k,y=2k,z=3k∵x+y+z

已知x:y:z=1:3:5,求（2x+3y-z)/(x+y-2z)的值已知x:y:z=1:3:5,求（2x+3y-z)/(x+y-2z)的值已知x:y:z=1:3:5,求（2x+3y-z)/(x+y-2z)的值因为：x:y:z=1:3:5所

已知实数x,y,z满足｜4x-4y+1｜+1/3√2y+z+z^2-z+1/4=0.求（y+z)*x^2的值.已知实数x,y,z满足｜4x-4y+1｜+1/3√2y+z+z^2-z+1/4=0.求（y+z)*x^2的值.已知实数x,y,z满

已知方程组【X:Y:Z=1:3:2,X+Y+Z=8】求Y+3Z的值已知方程组【X:Y:Z=1:3:2,X+Y+Z=8】求Y+3Z的值已知方程组【X:Y:Z=1:3:2,X+Y+Z=8】求Y+3Z的值设X,Y,Z分别为K,3K,2K.K+3K

已知方程组x:y:z=1:3:2x+y+z=8求y+3z的值已知方程组x:y:z=1:3:2x+y+z=8求y+3z的值已知方程组x:y:z=1:3:2x+y+z=8求y+3z的值x:y:z=1:3:2x/1=y/3=z/2所以y=3x,z

已知正数x,y,z满足x+2y+3z=1,求最小值已知正数x,y,z满足x+2y+3z=1,求最小值已知正数x,y,z满足x+2y+3z=1,求最小值依Cauchy不等式得[(x+2y)+(2y+3z)+(3z+x)][1/(x+2y)+4

1、已知X/2=Y/3=Z/4,(1)求（X-Y+Z)/(X+Y+Z)(2)若2x+3yz=18,求x,y,z2、已知2X=5Y,求X/Y,(X+Y)/Y,(X-Y)/Y3、如图已知AD/BD=AE/EC=3/2,试求（1）AB/BD(2)

已知实数xyz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xyz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xyz满足x/(x+1)=y/(

已知实数x,y,z满足x+y+z=2根号x-1+2根号y-1+2根号z-1求X+2Y+3Z已知实数x,y,z满足x+y+z=2根号x-1+2根号y-1+2根号z-1求X+2Y+3Z已知实数x,y,z满足x+y+z=2根号x-1+2根号y-1