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![](https://rs.olm.vn/images/avt/0.png?1311)
1/ 25 dm2=\(\dfrac{1}{4}m^2\)
2/ 36 dm2 =\(\dfrac{9}{25}m^2\)
3/ 450 cm2 =\(\dfrac{9}{200}m^2\)
4/ 575 cm2=\(\dfrac{23}{40}m^2\)
1) \(25dm^2=0.25m^2\)
2) \(36dm^2=0,36m^2\)
3) \(450cm^2=\dfrac{9}{200}m^2\)
4) \(575cm^2=\dfrac{23}{400}m^2\)
![](https://rs.olm.vn/images/avt/0.png?1311)
B1: \(45dm^2=0,45m^2\)
\(300cm^2=0,03m^2\)
\(57500mm^2=0,0575m^2\)
B2: chiếm \(\dfrac{24-9}{24}=\dfrac{5}{8}\)(ngày)
B3: lượng nước cần bơm tiếp cho đầy bể bằng
\(\dfrac{5000-3500}{5000}=\dfrac{3}{10}\)(bể)
![](https://rs.olm.vn/images/avt/0.png?1311)
25 dm2 = 0,25 m2
36 dm2 = 0,36 m2
450 cm2 = 0,045 m2
575 cm2 = 0,0575 m2
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(\frac{{125}}{{100}}\,{m^2}=\frac{{5}}{{4}}\,{m^2}=1\frac{{1}}{{4}}\,{m^2}\)
b) \(\frac{{218}}{{10000}}\,{m^2}=\frac{{109}}{{5000}}\,{m^2}\)
c) \(\frac{{240}}{{100}}\,{m^2}=\frac{{12}}{{5}}\,{m^2}=2\frac{{40}}{{100}}\,{m^2}\)
d) \(\frac{{34}}{{10000}}\,{m^2}=\frac{{17}}{{5000}}\,{m^2}\)
Nếu viết chúng theo đề-xi-mét vuông:
a) \(\frac{{125}}{1}\,d{m^2}\)
b) \(\frac{{218}}{{100}}\,{dm^2}=\frac{{109}}{{50}}\,{dm^2}=2\frac{{9}}{{50}}\,d{m^2}\)
c) \(\frac{{240}}{1}\,d{m^2}\)
d) \(\frac{{34}}{{100}}\,\,d{m^2}=\frac{{17}}{{50}}\,{dm^2}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 5hm = 5 100 km = 0,5km
b) 12dam = 12 100 km = 0,12km
c) 64m = 64 1000 km= 0,064km
d) 7dm = 7 10000 km = 0,007km
36 d m 2 = 9 25 m 2
45 d m 2 = 9 20 m 2
250 c m 2 = 1 40 m 2
475 c m 2 = 19 400 m 2