Ответ:
[tex] \frac{7}{9} [/tex]
Пошаговое объяснение:
[tex]( \frac{2}{5} - \frac{3}{20} ) \times 2 \times 2 - \frac{7}{4} \div \frac{63}{8} = \frac{1}{4} \times 2 \times 2 - \frac{7}{4} \times \frac{8}{63} = \frac{1}{2} \times 2 - \frac{2}{9} = 1 - \frac{2}{9} = \frac{7}{9} [/tex]
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Ответ:
[tex] \frac{7}{9} [/tex]
Пошаговое объяснение:
[tex]( \frac{2}{5} - \frac{3}{20} ) \times 2 \times 2 - \frac{7}{4} \div \frac{63}{8} = \frac{1}{4} \times 2 \times 2 - \frac{7}{4} \times \frac{8}{63} = \frac{1}{2} \times 2 - \frac{2}{9} = 1 - \frac{2}{9} = \frac{7}{9} [/tex]
задача : S=(399+1,4)•4=165,2