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Автор - katya10809

2 целых 1/7*(3+6/5) помогите пожалуйста

Ответ

Автор - Moncart

Ответ:

9

Объяснение:

2frac{1}{7}cdot left(3+frac{6}{5}right)=2frac{1}{7}cdot 4frac{1}{5}=9

3+frac{6}{5}=3+frac{1cdot5+1}{5}right)=4frac{1}{5}

2frac{1}{7}cdot 4frac{1}{5} = frac{1+2cdot7}{7}cdotfrac{1+4cdot5}{5}=frac{15}{7}cdotfrac{21}{5}=frac{15cdot21}{7cdot5}=frac{315}{35}=frac{9cdot35}{35}=9

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