viết 11/40 thành phân số thập phân
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\(\dfrac{13}{2}=\dfrac{13x5}{2x5}=\dfrac{65}{10}\)
\(\dfrac{11}{40}=\dfrac{11x25}{40x25}=\dfrac{275}{1000}\)
\(\dfrac{32}{5}=\dfrac{32x2}{5x2}=\dfrac{64}{10}\)
\(\dfrac{21}{250}=\dfrac{21x4}{250x4}=\dfrac{84}{1000}\)
\(\dfrac{1}{200}=\dfrac{1x5}{200x5}=\dfrac{5}{1000}\)
\(\dfrac{13}{2}=6,5=\dfrac{65}{10}\)
\(\dfrac{11}{40}=0,275=\dfrac{275}{1000}\)
\(\dfrac{32}{5}=6,4=\dfrac{64}{10}\)
\(\dfrac{21}{250}=0,084=\dfrac{84}{1000}\)
\(\dfrac{1}{200}=0,005=\dfrac{5}{1000}\)
\(\dfrac{25}{100};\dfrac{75}{1000};\dfrac{9}{100};\dfrac{2}{10}\)
\(\dfrac{1}{4}=0,25\)
\(\dfrac{3}{40}=0,075\)
\(\dfrac{72}{800}=0,09\)
\(\dfrac{6}{30}=0,2\)
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\(\dfrac{1}{4}\)
= (\(\dfrac{25}{8}\) + \(\dfrac{7}{4}\)): \(\dfrac{9}{4}\)
= \(\dfrac{39}{8}\) \(\times\) \(\dfrac{4}{9}\)
= \(\dfrac{13}{6}\)
6/12 = 1/2 = 5/10
9/25 = 9x4/25x4 = 36/100
20/40 = 20:4/40:4 = 5/10
11/2 = 11 x 5 / 2 x 5 = 55/10 , 15/4 = 15 x 25 / 4 x 25 = 375/100 , 31/5 = 31 x 2 / 5 x 2 = 62/10
275/1000 nhé bạn
11/40 = 275/1000