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a)<=>2/7:(13/24+5/24) b)<=>15/24-9/24-4/24 c)=7.5.39/13.14.15
<=>2/7:3/4 <=>2/24=1/12 =3/2.3
<=>2/7x4/3 =1/2
<=>8/21
a. \(\frac{2}{7}:\frac{13}{24}+\frac{2}{7}:\frac{5}{24}\)
= \(\frac{2}{7}:\left(\frac{13}{24}+\frac{5}{24}\right)\)
= \(\frac{2}{7}:\frac{3}{4}\)
= \(\frac{8}{21}\)
b. \(\frac{15}{24}-\frac{3}{8}-\frac{1}{6}\)
= \(\frac{15}{24}-\frac{9}{24}-\frac{4}{24}\)
= \(\frac{2}{24}=\frac{1}{12}\)
c. \(\frac{7}{13}.\frac{5}{14}.\frac{39}{15}\)
= \(\frac{7.5.3.13}{13.2.7.3.5}\)
= \(\frac{1}{2}\)
\(3A=\frac{6}{3\times\left(3+6\right)}+\frac{15}{9\times\left(9+15\right)}+...+\frac{39}{84\times\left(84+39\right)}\)
\(=\frac{1}{3}-\frac{1}{9}+\frac{1}{9}-\frac{1}{24}+...+\frac{1}{84}-\frac{1}{123}=\frac{1}{3}-\frac{1}{123}=\frac{40}{123}\)
\(\Rightarrow A=\frac{40}{3.123}=\frac{40}{369}\)
\(\frac{22}{7}\)> \(\frac{11}{5}\)vì 22 : 7 = 3,14 ; 11: 5 = 2,2
\(\frac{15}{59}\)< \(\frac{24}{97}\)vì 15 : 59 = 0,21 ; 24 : 97 = 0,24
\(\frac{11}{19}\)< \(\frac{13}{18}\)vì 11 : 19 = 0,57 ; 13 : 18 = 0,72
\(\frac{7}{10}\)> \(\frac{4}{9}\)vì 7 : 10 = 0,7 ; 4 : 9 = 0,44
\(\frac{\frac{1}{4}+\frac{1}{24}+\frac{1}{124}}{\frac{3}{4}+\frac{3}{24}+\frac{3}{124}}+\frac{\frac{2}{7}+\frac{2}{17}+\frac{2}{127}}{\frac{3}{7}+\frac{3}{17}+\frac{3}{127}}=\frac{\frac{1}{4}+\frac{1}{24}+\frac{1}{124}}{3\left(\frac{1}{4}+\frac{1}{24}+\frac{1}{124}\right)}+\frac{2\left(\frac{1}{7}+\frac{1}{17}+\frac{1}{127}\right)}{3\left(\frac{1}{7}+\frac{1}{17}+127\right)}=\frac{1}{3}+\frac{2}{3}=\) \(1\)
Trả lời:
\(\frac{2}{24}\cdot x=1\frac{5}{7}+46\frac{2}{6}\)
\(\frac{1}{12}\cdot x=\frac{12}{7}+\frac{139}{3}\)
\(\frac{1}{12}\cdot x=\frac{1009}{21}\)
\(x=\frac{1009}{21}:\frac{1}{12}\)
\(x=\frac{4036}{7}\)
Hc tốt #
\(\frac{2}{24}\cdot x=1\frac{5}{7}+46\frac{2}{6}\)
\(\frac{1}{12}\cdot x=\frac{12}{7}+\frac{139}{3}\)
\(\frac{1}{12}\cdot x=\frac{1009}{21}\)
\(x=\frac{1009}{21}:\frac{1}{12}\)
\(x=\frac{4036}{7}\)
\(\frac{2}{7}:\frac{13}{24}+\frac{2}{7}:\frac{5}{24}\)
\(=\frac{2}{7}x\frac{24}{13}+\frac{2}{7}x\frac{14}{5}=\frac{2}{13}x\frac{24}{7}+\frac{2}{5}x\frac{24}{7}\)
\(=\frac{24}{7}x\left(\frac{2}{13}+\frac{2}{5}\right)=\frac{24}{7}x\frac{36}{65}=\frac{864}{455}\)
=48/91+48/35
=864/455
study well
k nha
mk xin cảm ơn mọi người