Question

tính

\(70\left(\frac{252525}{565656}+\frac{252525}{727272}+\frac{252525}{909090}\right)\)

Answer 1

\(70.\left(\frac{252525}{565656}+\frac{252525}{727272}+\frac{252525}{909090}\right)\)

\(=70.\left(\frac{25}{56}+\frac{25}{72}+\frac{25}{90}\right)\)

\(=70.25.\left(\frac{1}{7.8}+\frac{1}{8.9}+\frac{1}{9.10}\right)\)

\(=1750.\left(\frac{1}{7}-\frac{1}{8}+\frac{1}{8}-\frac{1}{9}+\frac{1}{9}-\frac{1}{10}\right)\)

\(=1750.\left(\frac{1}{7}-\frac{1}{10}\right)\)

\(=1750.\frac{3}{70}\)

\(=75\)

Answer 2

Tính : 

\(=70.\left(\frac{25}{56}+\frac{25}{72}+\frac{25}{90}\right)\)

=\(70.\frac{15}{14}\)

=75 

knha

Answer 3

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