решите пример 6,75:3+27/40•[( 6 7/12-3 17/36)•2,5-4 1/3:0,65]. Created by marysyalabetska. matematika-ru

3:0,65]...

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решите пример 6,75:3+27/40•[( 6 7/12-3 17/36)•2,5-4 1/3:0,65]

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TAH4UIK $\frac{6.75}{3} + \frac{27}{40} \times ((6 \frac{7}{12} - 3 \frac{17}{36} )2.5 - 4 \frac{1}{3} \div 0.65 )= 2.25 + \frac{27}{40} (( \frac{79}{12} - \frac{125}{36} )2.5 - \frac{13}{3} \times \frac{100}{65} )$
$= 2.25 + \frac{27}{40} (( \frac{237 - 125}{36} )2.5 - \frac{1}{3} \times 20 )= 2.25 + \frac{27}{40} ( \frac{112}{36} \times \frac{25}{10} - \frac{20}{3} )$
$= 2.25 + \frac{27}{40} ( \frac{28}{9} \times \frac{5}{2} - \frac{20}{3} ) = 2.25 + \frac{27}{40} ( \frac{70}{9} - \frac{20}{3} ) = 2.25 + \frac{27}{40} ( \frac{70 - 60}{9} )$
$2.25 + \frac{27}{40} ( \frac{10}{9} )$ =2.25+0.75=3
Ответ:3

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