Question

Вычислите

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

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

Answer 1

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

Ответ: $6dfrac{5}{21}$