\(=18\times\left(\frac{37\times10101}{42\times10101}+\frac{37\times10101}{56\times10101}+\frac{37\times10101}{72\times10101}\right)\)
\(=18\times\left(\frac{37}{42}+\frac{37}{56}+\frac{37}{72}\right)\)
\(=666\left(\frac{1}{42}+\frac{1}{56}+\frac{1}{72}\right)\)
\(=666\times\left(\frac{1}{6}-\frac{1}{7}+\frac{1}{7}-\frac{1}{8}+\frac{1}{8}-\frac{1}{9}\right)\)
\(=666\times\left(\frac{1}{6}-\frac{1}{9}\right)\)
\(=666\times\frac{1}{18}=37\)
\(18\times\left(\frac{373737}{424242}+\frac{373737}{565656}+\frac{373737}{727272}\right)\)
\(=18\times\left(\frac{37}{42}+\frac{37}{56}+\frac{37}{72}\right)\)
\(=18\times\frac{37}{18}\)
\(=37\)
\(18.\left(\frac{373737}{424242}+\frac{373737}{565656}+\frac{373737}{727272}\right)\)
\(=18.\left(\frac{37}{42}+\frac{37}{56}+\frac{37}{72}\right)\)
\(=18.37.\left(\frac{1}{42}+\frac{1}{56}+\frac{1}{72}\right)\)
\(=666.\left(\frac{1}{6.7}+\frac{1}{7.8}+\frac{1}{8.9}\right)\)
\(=666.\left(\frac{1}{6}-\frac{1}{7}+\frac{1}{7}-\frac{1}{8}+\frac{1}{8}-\frac{1}{9}\right)\)
\(=666.\left(\frac{1}{6}-\frac{1}{9}\right)\)
\(=666.\left(\frac{6}{36}-\frac{4}{36}\right)\)
\(=666.\frac{2}{36}\)
\(=37\)
~ Ủng hộ nhé
\(18\times\left(\frac{373737}{424242}+\frac{373737}{565656}+\frac{373737}{727272}\right)\)
\(=18\times\left(\frac{37}{42}+\frac{37}{56}+\frac{37}{72}\right)\)
\(=18\times37\times\left(\frac{1}{42}+\frac{1}{56}+\frac{1}{72}\right)\)
\(=18\times37\times\left(\frac{1}{6\times7}+\frac{1}{7\times8}+\frac{1}{8\times9}\right)\)
\(=18\times37\times\left(\frac{1}{6}-\frac{1}{7}+\frac{1}{7}-\frac{1}{8}+\frac{1}{8}-\frac{1}{9}\right)\)
\(=18\times37\times\left(\frac{1}{6}-\frac{1}{9}\right)\)
\(=18\times37\times\frac{1}{18}\)
\(=666\times\frac{1}{18}\)
\(=37\)
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