Question

Вычислите

\left(3\dfrac{12}{17}+4\dfrac{5}{21}\right)-1\dfrac{12}{17}

Выберите один ответ:
6\dfrac{2}{3}
6\dfrac{12}{17}
6\dfrac{1}{3}
6\dfrac{5}{21}

Answer 1

$\left(3\dfrac{12}{17}+4\dfrac{5}{21}\right)-1\dfrac{12}{17}=3\dfrac{12}{17}-1\dfrac{12}{17}+4\dfrac{5}{21}=\left(3+\dfrac{12}{17}-1-\dfrac{12}{17}\right)+4\dfrac{5}{21}=\\=2+4\dfrac{5}{21}=6\dfrac{5}{21}$

Ответ: $6\dfrac{5}{21}$