若2x=3y=5z,则3x-2y+z/x+y-z
问题描述:
若2x=3y=5z,则3x-2y+z/x+y-z
答
3x-2y+z/x+y-z
=3x-y-2x/5x-z
=3x-2x/3-2/5-2x/5
=29x/15-2/5
或87y/30-2/5
或145z/30-2/5