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a)5/2=2,5
b)7/4=1,75
c)27/40=0,675
d)58/25=2,32
e)9/5=1,8
13/25=0,52
a;
c; \(\dfrac{1}{10}\) + \(\dfrac{4}{20}\) + \(\dfrac{9}{30}\)+\(\dfrac{16}{40}+\dfrac{25}{50}+\dfrac{36}{60}+\dfrac{49}{70}+\dfrac{64}{80}+\dfrac{81}{90}\)
= \(\dfrac{1}{10}+\dfrac{2}{10}+\dfrac{3}{10}+\dfrac{4}{10}+\dfrac{5}{10}+\dfrac{6}{10}+\dfrac{7}{10}+\dfrac{8}{10}+\dfrac{9}{10}\)
= \(\dfrac{1+2+3+4+5+6+7+8+9}{10}\)
= \(\dfrac{\left(1+9\right)+\left(2+8\right)+\left(3+7\right)+\left(4+6\right)+5}{10}\)
= \(\dfrac{10+10+10+10+5}{10}\)
= \(\dfrac{\left(10+10+10+10\right)+5}{10}\)
= \(\dfrac{10\times4+5}{10}\)
= \(\dfrac{45}{10}\)
= \(\dfrac{9}{2}\)
\(0,7=\frac{7}{10}\)
\(0,94=\frac{94}{100}\)
\(2,7=\frac{27}{100}\)
\(4,567=\frac{4567}{1000}\)
b) \(\frac{1}{4}=\frac{25}{100}\)
\(\frac{7}{5}=\frac{14}{10}\)
\(\frac{16}{25}=\frac{64}{100}\)
\(\frac{3}{2}=\frac{15}{10}\)
\(0,7=\frac{7}{10}\)
\(0,94=\frac{94}{100}\)
\(2,7=\frac{27}{10}\)
\(4,567=\frac{4567}{1000}\)
b) \(\frac{1}{4}=\frac{25}{100}\)
\(\frac{7}{5}=\frac{14}{10}\)
\(\frac{16}{25}=\frac{64}{100}\)
\(\frac{3}{2}=\frac{15}{10}\)
~ Chúc bạn học giỏi ! ~
^^
\(\frac{2}{4}=\frac{50}{100}\)
\(\frac{1}{2}=\frac{50}{100}\)
\(\frac{5}{40}=\frac{1}{8}=\frac{125}{1000}\)
\(\frac{9}{20}=\frac{45}{100}\)
\(\frac{7}{25}=\frac{28}{100}\)
\(\frac{17}{250}=\frac{136}{1000}\)
\(\frac{27}{50}=\frac{54}{100}\)
2/4 = 2x25/4x25 = 50/100 1/5 = 1x2/5x2 = 2/10
1/2 = 1x5/2x5 = 5/10 7/25=7x4/25x4 = 28/100
5/40= 5x25//40x25 = 125/1000 17/250 = 17x4/250x4 = 68/1000
9/20 = 9x5/20x5 = 45/100 27/50 = 27x2/50x2 =52/100