Question

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B = 70.(\(\frac{131313}{565656}+\frac{131313}{727272}+\frac{131313}{909090}\))

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Answer 1

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\(B=70\left(\frac{131313}{565656}+\frac{131313}{727272}+\frac{131313}{909090}\right)\)

\(B=70\left(\frac{13}{56}+\frac{13}{72}+\frac{13}{90}\right)\)

\(B=70.13\left(\frac{1}{56}+\frac{1}{72}+\frac{1}{90}\right)\)

\(B=70.13.\frac{3}{70}\)

\(B=39\)

Answer 2

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\(B=70\left(\frac{131313}{565656}+\frac{131313}{727272}+\frac{131313}{909090}\right)\)

   \(=70\left(\frac{13.10101}{56.10101}+\frac{13.10101}{72.10101}+\frac{13.10101}{90.10101}\right)\)

   \(=70\left(\frac{13}{56}+\frac{13}{72}+\frac{13}{90}\right)\)

   \(=70.13\left(\frac{1}{56}+\frac{1}{72}+\frac{1}{90}\right)\)

   \(=910\left(\frac{45}{2520}+\frac{35}{2520}+\frac{28}{2520}\right)\)

   \(=910.\frac{3}{70}\)

   \(=39\)

Vậy \(B=39\)