Question

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Answer 1

188.

$1)39 \frac{5}{7} \times 3 \frac{15}{37} - 2 \frac{5}{7} \times 3 \frac{15}{ 37}$

решаем по действиям :

$1)39 \frac{5}{7} \times 3 \frac{15}{37} = \frac{278}{7} \times \frac{126}{37} = \frac{35028}{259} =$

$= \frac{5004}{ 37} = 135\frac{9}{37} .$

$2)2 \frac{5}{7} \times 3 \frac{15}{37} = \frac{19}{7} \times \frac{126}{37} = \frac{2394}{259} =$

$= \frac{342}{37} = 9 \frac{9}{37} .$

$3)135 \frac{9}{37} - 9 \frac{9}{37} = \frac{5004}{37} - \frac{342}{ 37} = \frac{4462}{37} =$

$= 126.$

Ответ : 126 .

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$2)2 \frac{5}{9} \times 1 \frac{13}{28} + 4 \frac{4}{9} \times 1 \frac{13}{28}$

решаем по действиям :

$1)2 \frac{5}{9} \times 1 \frac{13}{28} = \frac{23}{9} \times \frac{41}{28} = \frac{943}{252} = 3 \frac{187}{252} .$

$2)4 \frac{4}{9} \times 1 \frac{13}{28} = \frac{40}{9} \times \frac{41}{28} = \frac{1640}{252} = \frac{410}{63} =$

$= 6 \frac{32}{63} .$

$3)3 \frac{187}{252} + 6 \frac{32}{63} = 9 + \frac{187}{252} + \frac{32}{63} =$

$= 9 + \frac{187}{252} + \frac{128}{252} = 9 + \frac{315}{252} = 9 + \frac{5}{4} =$

$= 10 \frac{1}{4} = 10.25$

Ответ :

$10.25.$