\(\frac{15^8+2}{15^8-1}\) và B =\(\frac{15^8}{15^8-3}\)
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28 tháng 2 2019

\(A=\frac{15^8-1+3}{15^8-1}=1+\frac{3}{15^8-1}\)

\(B=\frac{15^8-3+3}{15^8-3}=1+\frac{3}{15^8-3}\)

Ta có: \(15^8-3< 15^8-1\)

=> B>A

8 tháng 3 2019

A >1,B<1 suy ra A>B

a: \(=\left(-\dfrac{25}{140}+\dfrac{245}{140}+\dfrac{32}{140}\right)\cdot\dfrac{-69}{20}\)

\(=\dfrac{252}{140}\cdot\dfrac{-69}{20}\)

\(=\dfrac{9}{5}\cdot\dfrac{-69}{20}=\dfrac{-621}{100}\)

b: \(=\left(6-2-\dfrac{4}{5}\right)\cdot\dfrac{25}{8}-\dfrac{8}{5}\cdot4\)

\(=\dfrac{16}{5}\cdot\dfrac{25}{8}-\dfrac{32}{5}=\dfrac{18}{5}\)

c: \(=\left(\dfrac{2}{24}+\dfrac{18}{24}+\dfrac{14}{24}\right):\dfrac{-17}{8}\)

\(=\dfrac{34}{24}\cdot\dfrac{-8}{17}=\dfrac{-1}{3}\cdot2=-\dfrac{2}{3}\)

18 tháng 5 2021

\(a.\)

\(A=\)\(\frac{10^{15}+1}{10^{16}+1}\)

\(10A=\) \(\frac{10\left(10^{15}+1\right)}{10^{16}+1}\)

\(10A=\) \(\frac{10^{16}+10}{10^{16}+1}\)

\(10A=\)\(\frac{10^{16}+1+9}{10^{16}+1}\)

\(10A=\frac{10^{16}+1}{10^{16}+1}+\frac{9}{10^{16}+1}\)

\(10A=1+\frac{9}{10^{16}+1}\)

\(B=\frac{10^{16}+1}{10^{17}+1}\)

\(10B=\frac{10\left(10^{16}+1\right)}{10^{17}+1}\)

\(10B=\frac{10^{17}+10}{10^{17}+1}\)

\(10B=\frac{10^{17}+1+9}{10^{17}+1}\)

\(10B=\frac{10^{17}+1}{10^{17}+1}+\frac{9}{10^{17}+1}\)

\(10B=1+\frac{9}{10^{17}+1}\)

\(\Rightarrow10B< 10A\Rightarrow B< A\)\(\text{( vì tự làm ) }\)

19 tháng 5 2021

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\(A=\frac{3}{8^3}+\frac{7}{8^4}=\frac{3}{8^3}+\frac{3}{8^4}+\frac{4}{8^4}\)

\(B=\frac{3}{8^4}+\frac{7}{8^3}=\frac{3}{8^4}+\frac{3}{8^3}+\frac{4}{8^3}\)

Vì \(\frac{4}{8^4}< \frac{4}{8^3}\)=.> A < B

16 tháng 4 2017

A. \(\frac{3}{4}\) x \(\frac{8}{9}\)\(\frac{15}{16}\)x .... x \(\frac{899}{900}\)

\(\frac{1.3}{2^2}\) x \(\frac{2.4}{3^3}\)\(\frac{3.5}{4^2}\)x ... x \(\frac{29.31}{30^2}\)

\(\left(\frac{1.2.3...29}{2.3.4...30}\right).\left(\frac{3.4.5...31}{2.3.4...30}\right)\)

\(\frac{1}{30}.\frac{31}{2}\)\(\frac{31}{60}\)

B. 

\(\frac{1}{3}+\frac{3}{8}-\frac{7}{12}=\frac{8}{24}+\frac{9}{24}-\frac{14}{24}=\frac{8+9-14}{24}=\frac{3}{24}=\frac{1}{8}\)

20 tháng 5 2017

\(A=-1-4=-5\)

\(B=\frac{4}{3}.\frac{15}{7}-16\)

\(B=\frac{20}{7}-16\)

\(B=\frac{-92}{7}\)

\(C=\frac{28}{15}.0,25.3+\left(\frac{8}{15}-\frac{1}{4}\right)\div1\frac{23}{24}\)

\(C=1,4+\frac{17}{60}\div\frac{47}{24}\)

\(C=1,4+\frac{34}{235}\)

\(C=\frac{363}{235}\)

20 tháng 5 2017

\(A=\frac{-15}{8}+\frac{7}{8}-4\)

\(=-1-4=-5\)

\(B=\left(4-2\frac{2}{3}\right).2\frac{1}{7}-1\frac{3}{5}:\frac{1}{10}\)

\(=\frac{4}{3}.\frac{15}{7}-\frac{8}{5}:\frac{1}{10}\)

\(=\frac{20}{7}-16=\frac{-92}{7}\)

\(C=1\frac{13}{15}.\left(0,5\right)^2.3+\left(\frac{8}{15}-25\%\right):1\frac{23}{24}\)

\(=\frac{28}{15}.\frac{1}{4}.3+\frac{17}{60}:\frac{47}{24}\)

\(=\frac{7}{15}.3+\frac{17}{60}:\frac{47}{24}\)

\(=\frac{7}{5}+\frac{34}{235}=\frac{363}{235}\)