x/10 = y/8 =z/9 求x+2y+3z/y-5z

x/10 = y/8 =z/9 求x+2y+3z/y-5z (x*x+2)(y*y+4)(z*z+8)=64xyz,求x,y,z X/10=Y/8=Z/9,则X+Y+Z/2Y-3Z x/10=y/8=z/9,求(x+y+z)/x+(x+y)?x/10=y/8=z/9,求(x+y+z)/(x+y)？不好意思 已知(x+y)(x+z)=x,(y+z)(y+x)=2y,(z+x)(z+y)=3z,求x,y,z 已知：x^2/(z+y)+y^2/(x+z)+z^2/(x+y)=0,求x/(z+y)+y/(x+z)+z/(x+y)的值. x^2/(z+y)+y^2/(x+z)+z^2/(x+y)=0,求x/(z+y)+y/(x+z)+z/(x+y)的值 初中数学题难题一道~若整数x、y、z满足(9/8)^x×(10/9)^y×(16/15)^z=2,求x、y、z的值. 若x+y=6,xy=-8,求代数式(x+y-z)^2+(x+y-z)(x+y+z)-2·z(x-y) 若x-y=6,xy=-8,求代数式(x+y+z)²+(x-y-z)(x-y+z)-2·z(x+y)的值 已知x-y/x+y=y+z/2(y-z)=z+x/3(z-x),求证8x+9y+5z=0THX.. X+Y-Z=15 X+5Y+10Z=70 求：X、Y、Z x+2y=3x+2z=4y+z 求x:y:z (x+2)*y=z+360 x*(y-8)=z-48 求x/y/z各是多少?最好有解法(x+2)*y=z+360x*(y-8)=z-48求x/y/z各是多少？ 若X/10=Y/8=Z/9则X+Y+Z/Y+Z=? (4x-2y-z)-{5x-[8y-2z-(x-2y)]-x-(3y-10z)}=? 已知x+y+yz=5,y+z+xy=8,x+z+xy=9,求x,y,z x+y=6,y+z=8,x+z=10求x、y、z的值