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\(-\dfrac{7}{20}=-0.35\)
\(-\dfrac{12}{15}=-0.8\)
\(-\dfrac{16}{500}=-0.032\)
\(5\dfrac{4}{25}=5\cdot\dfrac{16}{100}=5.16\)
\(a.\)
\(0.3=\dfrac{3}{10}\)
\(0.72=\dfrac{72}{100}\)
\(1.5=\dfrac{15}{10}\)
\(9.347=\dfrac{9347}{1000}\)
\(b.\)
\(\dfrac{1}{2}=\dfrac{5}{10}\)
\(\dfrac{2}{5}=\dfrac{4}{10}\)
\(\dfrac{3}{4}=\dfrac{75}{100}\)
\(\dfrac{6}{25}=\dfrac{24}{100}\)
a) \(0,3=\dfrac{3}{10}\)
\(0,72=\dfrac{72}{100}\)
\(1,5=\dfrac{15}{10}\)
\(9,347=\dfrac{9347}{1000}\)
b) \(\dfrac{1}{2}=\dfrac{5}{10}\)
\(\dfrac{2}{5}=\dfrac{4}{10}\)
\(\dfrac{3}{4}=\dfrac{75}{100}\)
\(\dfrac{6}{25}=\dfrac{24}{100}\)
`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`
\(2\dfrac{3}{4}=\dfrac{2\times4+3}{4}=\dfrac{11}{4}\\ 3\dfrac{4}{5}=\dfrac{3\times5+4}{5}=\dfrac{19}{5}\\ 4\dfrac{3}{5}=\dfrac{4\times5+3}{5}=\dfrac{23}{5}\\ 11\dfrac{12}{13}=\dfrac{11\times13+12}{13}=\dfrac{155}{13}\\ 12\dfrac{11}{13}=\dfrac{12\times13+11}{13}=\dfrac{167}{13}\\ 3\dfrac{3}{5}=\dfrac{3\times5+3}{5}=\dfrac{18}{5}\)
2\(\dfrac{3}{4}\)=\(\dfrac{11}{4}\)
3\(\dfrac{4}{5}\)=\(\dfrac{19}{5}\)
4\(\dfrac{3}{5}\)=\(\dfrac{23}{5}\)
11\(\dfrac{12}{13}\)=\(\dfrac{155}{13}\)
12\(\dfrac{11}{13}\)=\(\dfrac{167}{13}\)
3\(\dfrac{3}{5}\)=\(\dfrac{18}{5}\).
\(\dfrac{3}{2}=1,5\)
\(\dfrac{1}{2}=0,5\)
\(\dfrac{5}{4}=1,25\)
\(\dfrac{3}{2}\)=1,5
\(\dfrac{1}{2}\)=0,5
\(\dfrac{5}{4}\)=1,25
a, \(\dfrac{4}{5}\) = 0,8
\(\dfrac{4}{5}\) = 80%
b, \(\dfrac{28}{25}\) = 1\(\dfrac{3}{25}\)
\(\dfrac{28}{25}\) = 112%
\(\dfrac{10}{4}\) = 2\(\dfrac{2}{4}\)
\(\dfrac{10}{4}\) = 250%
a) \(\dfrac{4}{5}=\dfrac{8}{10}\)
⇒ Đổi ra thập phân là 0,8
\(\dfrac{4}{5}=\dfrac{4.20}{5.20}=\dfrac{80}{100}=80\%\)
b)
+) \(\dfrac{28}{25}=1\dfrac{3}{25}\)
phần trăm : \(\dfrac{28}{25}=\dfrac{28.4}{25.4}=\dfrac{112}{100}=112\%\)
+) \(\dfrac{10}{4}=2\dfrac{2}{4}\)
phần trăm : \(\dfrac{10}{4}=\dfrac{10.25}{4.25}=\dfrac{250}{100}=250\%\)
Chúc bạn học tốt
\(\dfrac{54}{10}=5,4\)
\(4\dfrac{78}{1000}=4+\dfrac{78}{1000}=4+0,078=4,078\)
\(18\dfrac{4}{100}=18+\dfrac{4}{100}=18+0,04=18,04\)
\(\dfrac{1990}{10000}=\dfrac{199}{1000}=0,199\)
\(\dfrac{54}{10}=\dfrac{27}{5}=5,4\)
\(4\dfrac{78}{1000}=\dfrac{39}{125}=0,312\)
\(18\dfrac{4}{100}=\dfrac{18}{25}=0,72\)
\(\dfrac{1990}{10000}=\dfrac{199}{1000}=0,199\)
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