数学a/b=2/3 b/c=4/7 a:b:c求a:b:c=
问题描述：
数学a/b=2/3 b/c=4/7 a:b:c
求a:b:c=
答
a/b=2/3,即a=2/3b
b/c=4/7,即c=7/4b
a:b:c=2/3b：b：7/4b=2/3:1:7/4=8:12:9
答
a/b=2/3=8/12
b/c=4/7=12/21
a:b:c=8:12:21