解:16:20,
=(16÷4):(20÷4),
=4:5;
2:
,
=(2×3):(
×3),
=6:4;
=(6÷2):(4÷2),
=3:2;
0.24:4,
=(0.24×100):(4×100),
=24:400,
=(24÷8):(400÷8),
=3:50;
:
,
=(
×200):(
×200),
=162:9,
=(162÷9):(9÷9),
=18:1;
0.9:0.03,
=(0.9×100):(0.03×100),
=90:3,
=(90÷3):(3÷3),
=30:1;
:
,
=(
×6):(
×6),
=4:3.
分析:根据比的基本性质作答,即比的前项和后项同时乘或除以一个数(0除外)比值不变.
点评:此题主要考查了化简比的方法,另外还要注意化简比的结果是一个比,它的前项和后项都是整数,并且是互质数.