1) 15 4/9- 4 4/9• 3 3/8 =? 2) 81/88•(6-1 13/15•1 19/21) =? Разложено и понятно для 6 класса. Created by wamnesssi. matematika-ru

21) =? Разложено и понятно для 6 класса...

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1) 15 4/9- 4 4/9• 3 3/8 =?
2) 81/88•(6-1 13/15•1 19/21) =?
Разложено и понятно для 6 класса

Answers & Comments

alesyaperova

Ответ:

$1)15 \frac{4}{9} - 4 \frac{4}{9} \times 3 \frac{3}{8} = \frac{4}{9} \\ 1)4 \frac{4}{9} \times 3 \frac{3}{8} = \frac{40}{9} \times \frac{27}{8} = 15 \\ 2)15 \frac{4}{9} - 15 = \frac{4}{9}$

$2) \frac{81}{88} \times (6 - 1 \frac{13}{15} \times 1 \frac{19}{21} ) = 2 \frac{1}{4} \\ 1)1 \frac{13}{15} \times 1 \frac{19}{21} = \frac{28}{15} \times \frac{40}{21} = \\ = \frac{4}{3} \times \frac{8}{3} = \frac{32}{9} = 3 \frac{5}{9}$

$2)6 - 3 \frac{5}{9} = 5 \frac{9}{9} - 3 \frac{5}{9} = 2 \frac{4}{9} \\ 3) \frac{81}{88} \times 2 \frac{4}{9} = \frac{81}{88} \times \frac{22}{9} = \frac{9}{4} = 2 \frac{1}{4}$

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