已知x/2=y/3=z/5≠0,求x-y+3z/3x+2y的值.我是预习的，麻烦过程写清楚点！

已知 x/2 = y/3 = z/5 ≠ 0 求 (x-y+3z) / (3x+2y) 已知{x-5y+2z=0 3x-5y-4z=0,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 分式加减法：已知x+y/z=x+z/y=y+z/x(x+y+z≠0）,求x+y-z/x+y+z 已知x+y/z=x+z/y=y+z/x(x+y+z≠0）,求x+y-z/x+y+z的步骤 已知x+y/z=x+z/y=y+z/x(x+y+z≠0）,求x+y-z/x+y+z的步骤 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. 已知z、y、z同时满足x+3y-5z=0,2x-y-3z=0,求x:y:z 已知x+y-z=0,2x-y+2z=0 求（3x-2y+5z)/(5x-3y+2z)的值 已知4x-3y-6z=0,x+2y-7z=0,求5x+2y-z/2x-3y-10z 已知x+2y-3z=0,2x+3y+5z=0,求(x+y+z)除以（x-y+z) 已知x+2y-3z=0,2x+3y+5z=0,求(x+y+z)除以（x-y+z) 已知x+4y+3z=3x-2y-5z=0,求x+2y-z/2x-3y+7z的值 已知:x+y+z=0,5x-3y-z=0,求:5x-y+z/2x+8y+7z 的值 已知3x+4y+5z=0,2x+3y-4z=0,求(x+y+z)/(x-y+z) 已知2x+3y-4z=0,3x+4y+5z=0,求x+y+z/（除以）x-y+z的值. 已知{3x+4y+5z=0,2x+3y-4z=0,求x+y+z/x-y+z的值.