viết các phân số sau thành phân số thập phân
13/2 , 11/40 , 32/5 , 21/250 , 1/200
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\(\dfrac{13}{2}=\dfrac{13x5}{2x5}=\dfrac{65}{10}\)
\(\dfrac{11}{40}=\dfrac{11x25}{40x25}=\dfrac{275}{1000}\)
\(\dfrac{32}{5}=\dfrac{32x2}{5x2}=\dfrac{64}{10}\)
\(\dfrac{21}{250}=\dfrac{21x4}{250x4}=\dfrac{84}{1000}\)
\(\dfrac{1}{200}=\dfrac{1x5}{200x5}=\dfrac{5}{1000}\)
\(\dfrac{13}{2}=6,5=\dfrac{65}{10}\)
\(\dfrac{11}{40}=0,275=\dfrac{275}{1000}\)
\(\dfrac{32}{5}=6,4=\dfrac{64}{10}\)
\(\dfrac{21}{250}=0,084=\dfrac{84}{1000}\)
\(\dfrac{1}{200}=0,005=\dfrac{5}{1000}\)
Bài 1:a, \(\dfrac{13}{2}\) = \(\dfrac{13\times5}{2\times5}\) = \(\dfrac{65}{10}\)
b, \(\dfrac{11}{40}\) = \(\dfrac{11\times25}{40\times25}\) = \(\dfrac{275}{1000}\)
c, \(\dfrac{21}{250}\) = \(\dfrac{21\times4}{250\times4}\) = \(\dfrac{84}{1000}\)
d, \(\dfrac{27}{45}\) = \(\dfrac{27:9}{45:9}\) = \(\dfrac{3}{5}\) = \(\dfrac{3\times2}{5\times2}\) = \(\dfrac{6}{10}\)
Bài 2:
a, (3\(\dfrac{1}{8}\) + 1\(\dfrac{3}{4}\)): 2\(\dfrac{1}{4}\)
= (\(\dfrac{25}{8}\) + \(\dfrac{7}{4}\)): \(\dfrac{9}{4}\)
= \(\dfrac{39}{8}\) \(\times\) \(\dfrac{4}{9}\)
= \(\dfrac{13}{6}\)
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
9/30 = 3/10 = 0,3
11/25 = 44/100 = 0,44
64/400 = 16/100 = 0,16
21/50 = 42/100 = 0,42
13/250 = 48/1000 = 0,048
Nhấn đúng cho mk nha!!!!!!!!!!!!!!
9/30 = 3/10
11/25 = 44/100
64/400 = 16/100
21/50 = 42/100
13/250 = 52/1000
Ko biết mk lm có đúng ko???
9/30=3/10
11/25=44/100
64/400=16/100
21/50=42/100
13/250=52/1000
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) \(\frac{1}{2}=1\div2=0,5\) \(\frac{3}{4}=3\div4=0,75\)
\(\frac{15}{8}=15\div8=1,875\) \(\frac{7}{25}=7\div25=0,28\)
\(\frac{19}{30}=19\div30=0,63\) \(\frac{21}{125}=21\div125=0,168\)
\(\frac{13}{2}\)\(=\frac{65}{10}\)\(=6,5\)
\(\frac{11}{40}\)\(=\frac{11x25}{40x25}\)\(=\frac{275}{1000}\)\(=0,275\)
\(\frac{32}{5}\)\(=\frac{64}{10}\)\(=6,4\)
\(\frac{21}{250}\)\(=\frac{84}{1000}\)\(=0,084\)
\(\frac{1}{200}\)\(=\frac{5}{1000}\)\(=0,005\)