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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
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![](https://rs.olm.vn/images/avt/0.png?1311)
\(=\dfrac{4}{3}\left(\dfrac{3}{9.12}+\dfrac{3}{12.15}+...+\dfrac{3}{252.255}\right)\)
\(=\dfrac{4}{3}\left(\dfrac{1}{9}-\dfrac{1}{12}+\dfrac{1}{12}-\dfrac{1}{15}+...+\dfrac{1}{252}-\dfrac{1}{255}\right)\)
\(=\dfrac{4}{3}\left(\dfrac{1}{9}-\dfrac{1}{255}\right)=\dfrac{4}{3}\times\dfrac{82}{765}=\dfrac{328}{2295}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
4.
a. 4,5dm b. 12,23m
7,03m 9,192m
8,057m
5.
a. 4,13m b. 0,3m
6,5dm 0,3dm
6,12dm 0,15m
Bài 4:
a) 4dm5cm=4,5dm
7m3cm=7,03m
b) 12m23cm=12,23m
9m192mm=9,192m
8m57mm=8,057m
Bài 5:
a) 4m13cm=4,13m
6dm5cm=6,5dm
6dm12mm=6,12m
b) 3dm=0,3m
3cm=0,3dm
15cm=0,15m
![](https://rs.olm.vn/images/avt/0.png?1311)