已知x:y:z=3:4:5,且x+y+z=12,那么x=?,y=?,z=?

问题描述:

已知x:y:z=3:4:5,且x+y+z=12,那么x=?,y=?,z=?

令x:y:z=3:4:5=k
x=3k
y=4k
z=5k
x+y+z=12
3k+4k+5k=12
12k=12
k=1
x=3k=3*1=3
y=4k=4*1=4
z=5k=5*1=5