设x/3=y/5=z/7,则x+y/y=? y+3x/3y-2z=?

问题描述:

设x/3=y/5=z/7,则x+y/y=? y+3x/3y-2z=?

x/3=y/5=z/7
x+y/y
=x/y+1
=3/5+1
=8/5
y+3x/3y-2z
=5x/3+3x/3*(5x/3)-2*(7x/3)
=(14x/3)/(x/3)
=14