问题
解答题
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答案
12:21,
=(12÷3):(21÷3),
=4:7;
0.25:1,
=(0.25×4):(1×4),
=1:4;
2:
,1 4
=(2×4):(
×4),1 4
=8:1;
:2 5
,1 4
=(
×20):(2 5
×20),1 4
=8:5;
0.3﹕0.4,
=(0.3×10)﹕(0.4×10),
=3:4;
16﹕20,
=(16÷4)﹕(20÷4),
=4:5.