若x/3=y/4=z/5(xyz≠0）,则x+y+z/2x=多少

若xyz≠0且4(x/z)-5(y/z)=-2,(x/z)+4(y/z)=3,求x:y:z 若x+2y-9z=0,z-3y-5z=0,（xyz≠0）求：x²-4y²+9z²分之（2x²+3y²+7z²）若x+2y-9z=0,z-3y-5z=0,（xyz≠0）,求：（x²-4y²+9z²）分之（2x²+3y²+7z²）的值. 若（x+y）/3=（y+z）/5=（8+z）/4,且xyz≠0,求x∶y∶z.若（x+y）/3=（y+z）/5=（8+z）/4且xyz≠0,求x∶y∶z. 若xyz≠0且{4x-5y+2z=0 x+4y-3z=0 ,求x：y：z. 已知2x-4y-5z=0,-3x+y+4z=0,（xyz≠0）则x：y:z=________ 若x+y除以3=y+z除以5=z+x除以4,且xyz≠0,则x:y:z=? 若xyz≠0且4x-5y=-2z,x+4y=3z,求x：y：z 若x/3=y/4=z/5(xyz≠0）,则x+y+z/2x=多少 (x+y)/3=(y+z)/5=(z+x)/4 ,xyz不等于0,求x:y:z 若1/2x=1/3y=1/4z,且xyz≠0,求xyz最后一段为“求x:y:z” 已知 (x+y-z)/z=(x-y+z)/y=(y+z-x)/x,且xyz≠0,求代数式 ((x+y)(y+z)(x+z))/xyz 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= 3x^2y-{xyz-（2xyz-x^2z）-4x^2z+[3x^2y-(4xyz-5x^z-3xyz)]}化简 已知2x-4y-5z=0,-3x+y+4z=0 (xyz≠0)则x/y/z=? 已知方程组4X-3y-3Z=0,X-3y+Z=0,（XyZ≠0）,求X：y：Z的值. 已知一方程组：x-3y+7z=0与x-2y+4z=0(xyz≠0）,求x:y:z. 若xyz不等于0,且{4x-5y+2z=0,x+4y-3z=0,求x:y:z 若xyz不等于0,且4x-5y+2z=0,x+4y-3z=0,求x：y：z的值.