Предмет: Математика, автор: anisiadenisenko00

(6.4/5 -2.3/4) :(2.16/21 +3.2/3) знайти значення виразу ( по діям )

Ответы

Автор ответа: alesyaperova

Ответ:

$1)6 \frac{4}{5} - 2 \frac{3}{4} = 6 \frac{16}{20} - 2 \frac{15}{20} = 4 \frac{1}{20}$

$2)2 \frac{16}{21} + 3 \frac{2}{3} = 2 \frac{16}{21} + 3 \frac{14}{21} = \\ = 5 \frac{30}{21} = 6 \frac{9}{21} = 6 \frac{3}{7}$

$3)4 \frac{1}{20} \div 6 \frac{3}{7} = \frac{81}{20} \div \frac{45}{7} = \\ \frac{81}{20} \times \frac{7}{45} = \frac{27 \times 7}{20 \times 15} = \frac{189}{300}$

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