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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) \(\frac{1}{2}=1\div2=0,5\) \(\frac{3}{4}=3\div4=0,75\)
\(\frac{15}{8}=15\div8=1,875\) \(\frac{7}{25}=7\div25=0,28\)
\(\frac{19}{30}=19\div30=0,63\) \(\frac{21}{125}=21\div125=0,168\)
\(\dfrac{7}{5}=1,4\\ \dfrac{34}{20}=1,7\\ \dfrac{25}{50}=0,5\\ \dfrac{6}{25}=0,24\\ \dfrac{24}{125}=0,192\)
4 phần 5=...80/100...=..0,8...
123 phần 125=.984/1000.....=..0,984.....
13 phần 25=...52/100..=..0,52......
9 phần 75=..3/25....=...12/100....=...0,12.......
\(\frac{4}{5}=\frac{8}{10}=0,8\)
\(\frac{123}{125}=\frac{984}{1000}=0,984\)
\(\frac{13}{25}=\frac{52}{100}=0,52\)
\(\frac{9}{75}=\frac{3}{25}=\frac{12}{100}=0,12\)
@Duongg
a;
c; \(\dfrac{1}{10}\) + \(\dfrac{4}{20}\) + \(\dfrac{9}{30}\)+\(\dfrac{16}{40}+\dfrac{25}{50}+\dfrac{36}{60}+\dfrac{49}{70}+\dfrac{64}{80}+\dfrac{81}{90}\)
= \(\dfrac{1}{10}+\dfrac{2}{10}+\dfrac{3}{10}+\dfrac{4}{10}+\dfrac{5}{10}+\dfrac{6}{10}+\dfrac{7}{10}+\dfrac{8}{10}+\dfrac{9}{10}\)
= \(\dfrac{1+2+3+4+5+6+7+8+9}{10}\)
= \(\dfrac{\left(1+9\right)+\left(2+8\right)+\left(3+7\right)+\left(4+6\right)+5}{10}\)
= \(\dfrac{10+10+10+10+5}{10}\)
= \(\dfrac{\left(10+10+10+10\right)+5}{10}\)
= \(\dfrac{10\times4+5}{10}\)
= \(\dfrac{45}{10}\)
= \(\dfrac{9}{2}\)
\(\frac{2}{5}=\frac{4}{10}\)\(\frac{5}{2}=\frac{25}{10}\) \(\frac{16}{25}=\frac{64}{100}\) \(\frac{132}{125}=\frac{1052}{1000}\)
6/5=1,2 3/8=0,375 9/125=0,072
7/2=3,5 19/25=0,76 24/16=1,5
15/4=3,75 30/50=0,5 9/24=0,375
li-ke cho mình nha