biến 3/8 thành phân số thập pân
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\(\frac{5}{8}=\frac{5.125}{8.125}=\frac{625}{1000}\)
dấu . là dấu nhân nhé bạn
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\(\dfrac{79}{11}=7+\dfrac{2}{11}=7+\dfrac{18}{99}\)
\(=7,\left(18\right)\)
\(\dfrac{91}{37}=2+\dfrac{17}{37}=2+\dfrac{459}{999}\)
\(=2,\left(459\right)\)
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Ta có :
\(\frac{1}{2}=1\div2=0,5\)
\(\frac{2}{3}=2\div3=0,666...\)
\(\frac{3}{4}=3\div4=0,75\)
\(\frac{4}{5}=4\div5=0,8\)
\(\frac{5}{6}=5\div6=0,8333...\)
\(\frac{6}{7}=6\div7=0,8671...\)
\(\frac{7}{8}=7\div8=0,875\)
\(\frac{8}{9}=8\div9=0,888...\)
Vậy các phân số có thể là : \(\frac{1}{2};\frac{3}{4};\frac{4}{5};\frac{7}{8}\)
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1/4 = 25/100 = 0,25
5/2 = 25/10 = 2,5
13/8 = 1625/1000 = 1,625
250/500 = 500/1000 = 0,5
46/200 = 23/100 = 0,23
13/4 = 325/100 = 3,25
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\(\frac{5}{8}=\frac{5\times125}{8\times125}=\frac{625}{1000}=0,625\)
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Ta có :
\(\frac{3}{8}=\frac{3\times125}{8\times125}=\frac{375}{1000}\)
Vậy 3/8 = 375/1000
375/1000 là phân số thập phân
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\(\dfrac{13}{2}\)=\(\dfrac{65}{10}\)
\(\dfrac{4}{5}\)=\(\dfrac{8}{10}\)
\(\dfrac{22}{55}\)=\(\dfrac{4}{10}\)
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a) \(\frac{15}{10}=1,5\) \(\frac{675}{10}=6,75\) \(\frac{7}{10}=0,7\)
\(\frac{79}{100}=0,79\) \(\frac{5}{100}=0,05\) \(\frac{67}{100}=0,67\)
b) \(\frac{1}{2}=1\div2=0,5\) \(\frac{3}{4}=3\div4=0,75\)
\(\frac{15}{8}=15\div8=1,875\) \(\frac{7}{25}=7\div25=0,28\)
\(\frac{19}{30}=19\div30=0,63\) \(\frac{21}{125}=21\div125=0,168\)
\(\frac{3}{8}\)\(=\)\(\frac{375}{1000}\)\(=0,375\)
3/8 thành phân số thập phân : 0,375