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A = 3./4 * 5/9 + ( 5/2 - 1/2 )
A = 3/4 * 5/9 + 2
A = 5/ 12 + 2
A = 2 5/12 hoặc 29/12
**** cho mình nhé
\(a)5871+[247-82]\times5\) \(b)1,71:[4,418+1,582]+1,94\)
\(=5871+\)\(165\) \(\times5\) \(=1,71:\) \(6\) \(+1,94\)
\(=5871\)\(+\) \(825\) \(=\) \(0,285\) \(+1,94\)
\(=\) \(6696\) \(=\) \(2,225\)
\(c)\frac{7}{2}-\frac{3}{4}:\frac{1}{2}+\frac{2}{5}\) \(d)6\times2\frac{1}{3}-4\frac{3}{7}\)
\(=\)\(\frac{7}{2}-\frac{3}{2}+\frac{2}{5}\) \(=6\times2-\frac{31}{7}\)
\(=2+\frac{2}{5}\) \(=12-\frac{31}{7}\)
\(=\frac{12}{5}\) \(=\frac{53}{7}\)
\(B=\)\(\left(1-\frac{1}{2}\right)\left(1-\frac{1}{3}\right)\left(1-\frac{1}{4}\right)..\left(1-\frac{1}{2016}\right)\left(1-\frac{1}{2017}\right)\)
\(B=\frac{1}{2}.\frac{2}{3}.\frac{3}{4}...\frac{2015}{2016}.\frac{2016}{2017}\)
\(\Rightarrow B=\frac{1}{2017}\)
Ta có:\(B=\left(1-\frac{1}{2}\right)\times\left(1-\frac{1}{3}\right)\times............\times\left(1-\frac{1}{2017}\right)\)
\(=\frac{1}{2}\times\frac{2}{3}\times............\times\frac{2016}{2017}\)
\(=\frac{1\times2\times..........\times2016}{2\times3\times...........\times2017}=\frac{1}{2017}\)
4/1x3+4/3x5
=4/1x3/1+4/3x5/1
=12+20/3
80/1=80
chúc bạn học tốt