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bạn j ơi câu hỏi dễ thế này mà cũng hỏi là sao
nếu bạn cấp 1 thì thôi mà bạn học cấp 2 thì bạn nên cố gắng nhiều hơn nhé
mình sẽ giải chi tiết để bạn bt cách làm:
(136/15-28/5+62/10).21/24
=(272/30-168/30+186/30).21/24
=290/30.21/24
=chắc đến đây bạn làm đc rồi pp
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![](https://rs.olm.vn/images/avt/0.png?1311)
\(\left(\frac{136}{15}-\frac{28}{5}+\frac{62}{10}\right).\frac{21}{24}\)
\(=\left(\frac{136}{15}-\frac{28}{5}+\frac{31}{5}\right).\frac{21}{24}\)
\(=\left[\frac{136}{15}-\left(\frac{28}{5}-\frac{31}{5}\right)\right].\frac{21}{24}\)
\(=\left(\frac{136}{15}+\frac{3}{5}\right).\frac{21}{24}\)
\(=\frac{29}{3}.\frac{21}{24}\)
\(=\frac{203}{24}\)
Study well ! >_<
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\(F=\dfrac{5}{6}+6\dfrac{5}{6}\left(11\dfrac{5}{20}-9\dfrac{1}{4}\right):8\dfrac{1}{3}\)
\(F=\dfrac{5}{6}+\dfrac{41}{6}\left(\dfrac{225}{20}-\dfrac{37}{4}\right):\dfrac{25}{3}\)
\(F=\dfrac{5}{6}+\dfrac{41}{6}.2.\dfrac{3}{25}\)
\(F=\dfrac{5}{6}+\dfrac{41}{25}.\dfrac{3}{25}\)
\(F=\dfrac{5}{6}+\dfrac{41}{25}\)
\(F=\dfrac{371}{150}\)
\(D=\left(\dfrac{136}{15}-\dfrac{28}{5}+\dfrac{62}{10}\right)\times\dfrac{21}{24}\)
\(D=\left(\dfrac{272}{30}-\dfrac{168}{30}+\dfrac{186}{30}\right)\times\dfrac{21}{24}\)
\(D=\dfrac{290}{30}\times\dfrac{21}{24}\)
\(D=\dfrac{29}{3}\times\dfrac{7}{8}\)
\(D=\dfrac{203}{24}\)
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b)B=(136/15 - 28/5 +31/5).21/24
B=(136/15-(28/5 - 31/5).21/24
B=(136/15 + 3/5).21/24
B=29/3.21/24
B=203/24
\(A=1.2.3...100-1.2.3...99-1.2.3...98.99^2\)
\(=1.2.3...99\left(100-1-99\right)\)
\(=1.2.3...99.0=0\)
\(\left(\frac{136}{15}-\frac{28}{5}+\frac{62}{10}\right)\times\frac{21}{24}=\left(\frac{272}{30}-\frac{168}{30}+\frac{186}{30}\right)\times\frac{21}{24}=\frac{290}{30}\times\frac{21}{24}=\frac{29}{3}\times\frac{7}{8}=\frac{203}{24}=8\frac{11}{24}\)