(1)13:91
=(13÷13):(91÷13)
=1:7;
13:91
=1:7
=1÷7
=
1
7;
(2)1:0.8
=(1×5):(0.8×5)
=5:4;
1:0.8
=5:4
=5÷4
=1.25;
(3)6:
2
5
=(6×5÷2):(
2
5×5÷2)
=15:1;
6:
2
5
=15:1
=15÷1
=15;
(4)
3
4:
4
9
=(
3
4×36):(
4
9×36)
=27:16;
3
4:
4
9
=27:16
=27÷16
=
27
16;
填表如下:
比 13:91 1:0.8 6:
2
5
3
4:
4
9
最简比 1:7 5:4 15:1 27:16
比值
1
7 1.25 15
27
16