Viết các hỗn số sau thành số thập phân
a) \(7\dfrac{3}{10}\) b) \(9\dfrac{25}{100}\) c) \(3\dfrac{2}{5}\) d) \(7\dfrac{1}{4}\) e) \(1\dfrac{1}{25}\)
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`a,3/10=0,3`
`3/100=0,03`
`4 25/100=4 1/4=4,25`
`2002/1000=2,002`
`b,1/4=0,25`
`3/5=0,6`
`7/8=0,875`
`1 1/2=1,5`
4\(\dfrac{1}{2}\)=4,5 3\(\dfrac{4}{5}\)=3,8 2\(\dfrac{3}{4}\)=2,75 1\(\dfrac{12}{25}\)=1,48.
4 1/2=4,5
3 4/5=3,8
2 3/4=2,75
1 12/25=1,48
đúng 100% nha
\(\dfrac{3}{25}=\dfrac{3\times4}{25\times4}=\dfrac{12}{100}\\ \dfrac{7}{8}=\dfrac{7\times125}{8\times125}=\dfrac{875}{1000}\\ \dfrac{9}{45}=\dfrac{9:9}{45:9}=\dfrac{1}{5}=\dfrac{1\times2}{5\times2}=\dfrac{2}{10}\)
\(-\dfrac{7}{20}=-0.35\)
\(-\dfrac{12}{15}=-0.8\)
\(-\dfrac{16}{500}=-0.032\)
\(5\dfrac{4}{25}=5\cdot\dfrac{16}{100}=5.16\)
1.a) 0,7 = \(\dfrac{7}{10}\) ; 0,94=\(\dfrac{94}{100}=\dfrac{47}{50}\) ; 2,7\(=\dfrac{27}{10}\) ; 4,567\(=\dfrac{4567}{1000}\)
b) \(\dfrac{1}{4}=0,25\) ; \(\dfrac{7}{5}=1,4\) ; \(\dfrac{16}{25}=0,64\) ; \(\dfrac{3}{2}=1,5\)
2.a) 0,6 = 60% ; 0,48 = 48% ; 6,25 = 625%
b) 7% = 0,07 ; 37% = 0,37 ; 785% = 7,85
3.a) \(\dfrac{1}{4}\)giờ = 0,25 giờ
\(\dfrac{3}{2}\)phút = 1,5 phút
\(\dfrac{2}{5}\)giờ = 0,4 giờ
b) \(\dfrac{3}{4}\)kg = 0,75kg
\(\dfrac{7}{10}\)m = 0,7m
\(\dfrac{3}{5}\)km = 0,6km
4.a) 7,305 ; 7,35 ; 7,6 ; 7,602
b) 62,3 ; 61,98 ; 54,7 ; 54,68
5.
0,3< 0,31 ; 0,32 ; 0,33 <0,4
6.
\(\dfrac{7}{10}=0,7\) ; \(\dfrac{7}{100}=0,07\) ; \(6\dfrac{38}{100}=6,38\) ; \(\dfrac{2014}{1000}=2,014\)
\(\dfrac{3}{2}=1,5\) ; \(\dfrac{2}{5}=0,4\) ; \(\dfrac{5}{8}=0,625\) ; \(1\dfrac{1}{4}=1.25\)
bài này trong sách giáo khoa lớp 5 đúng ko dù bây h anh lớp 6
2/
a/ \(\dfrac{7}{10}=\dfrac{7.15}{10.15}=\dfrac{105}{150}\)
\(\dfrac{11}{15}=\dfrac{11.10}{15.10}=\dfrac{110}{150}\)
-Vì \(\dfrac{105}{150}< \dfrac{110}{150}\)(105<110)nên \(\dfrac{7}{10}< \dfrac{11}{15}\)
b/ \(\dfrac{-1}{8}=\dfrac{-1.3}{8.3}=\dfrac{-3}{24}\)
-Vì \(\dfrac{-3}{24}>\dfrac{-5}{24}\left(-3>-5\right)\)nên\(\dfrac{-1}{8}>\dfrac{-5}{24}\)
c/\(\dfrac{25}{100}=\dfrac{25:25}{100:25}=\dfrac{1}{4}\)
\(\dfrac{10}{40}=\dfrac{10:10}{40:10}=\dfrac{1}{4}\)
-Vì \(\dfrac{1}{4}=\dfrac{1}{4}\)nên\(\dfrac{25}{100}=\dfrac{10}{40}\)
a/ \(\dfrac{7}{10}< \dfrac{11}{15}\)
c/ \(\dfrac{25}{100}=\dfrac{10}{40}\)
a) \(\dfrac{3}{5}+\dfrac{1}{6}=\dfrac{18}{30}+\dfrac{5}{30}=\dfrac{23}{30}\)
b) \(4+\dfrac{2}{5}=\dfrac{20}{5}+\dfrac{2}{5}=\dfrac{22}{5}\)
c) \(\dfrac{25}{12}-\dfrac{7}{6}=\dfrac{25}{12}-\dfrac{14}{12}=\dfrac{11}{12}\)
d) \(\dfrac{9}{7}-\dfrac{7}{6}=\dfrac{54}{42}-\dfrac{49}{42}=\dfrac{5}{42}\)
d) \(\dfrac{3}{7}\times\dfrac{2}{5}=\dfrac{3\times2}{7\times5}=\dfrac{6}{35}\)
\(a.\)
\(0.3=\dfrac{3}{10}\)
\(0.72=\dfrac{72}{100}\)
\(1.5=\dfrac{15}{10}\)
\(9.347=\dfrac{9347}{1000}\)
\(b.\)
\(\dfrac{1}{2}=\dfrac{5}{10}\)
\(\dfrac{2}{5}=\dfrac{4}{10}\)
\(\dfrac{3}{4}=\dfrac{75}{100}\)
\(\dfrac{6}{25}=\dfrac{24}{100}\)
a) \(0,3=\dfrac{3}{10}\)
\(0,72=\dfrac{72}{100}\)
\(1,5=\dfrac{15}{10}\)
\(9,347=\dfrac{9347}{1000}\)
b) \(\dfrac{1}{2}=\dfrac{5}{10}\)
\(\dfrac{2}{5}=\dfrac{4}{10}\)
\(\dfrac{3}{4}=\dfrac{75}{100}\)
\(\dfrac{6}{25}=\dfrac{24}{100}\)
\(7\dfrac{3}{10}=\dfrac{73}{10};9\dfrac{25}{100}=\dfrac{37}{4};3\dfrac{2}{5}=\dfrac{17}{5};7\dfrac{1}{4}=\dfrac{29}{4};1\dfrac{1}{25}=\dfrac{26}{5}\)
a) \(7\dfrac{3}{10}=\dfrac{73}{10}=7.3\)
b)9\(\dfrac{25}{100}=9\dfrac{1}{4}=\dfrac{37}{4}=9.25\)
c)3\(\dfrac{2}{5}=\dfrac{12}{5}=2.4\)
d)\(7\dfrac{1}{4}=\dfrac{29}{4}=7.25\)
e)1\(\dfrac{1}{25}=\dfrac{26}{25}=1.04\)