在○里填上“>”、“<”或“=”号.
20:40○40:20????????9.3:0.3○3.1:0.1?????????25:100○????????1.6:9○1.6:8.
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解:①20:40
=20÷40
=0.5,
40:20
=40÷20
=2,
20:40<40:20;???
②9.3:0.3
=9.3÷0.3
=31,
3.1:0.1
=3.1÷0.1
=31,
9.3:0.3=3.1:0.1;?????????
③25:100
=25÷100
=,
25:100=;????????
④1.6:9=1.6÷9,
1.6:8=1.6÷8,
9>8,
1.6:9<1.6:8.
故