Question

уравнение 1 шестая игрик + 5 двенадцатый игрик равно 8,4
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Answer 1

Ответ:

Пошаговое объяснение:

$\frac{1}{6} *y + \frac{5}{12} *y = 8.4\\\frac{2}{12} *y + \frac{5}{12} *y = 8.4\\y*(\frac{2}{12} + \frac{5}{12}) = 8.4\\y*\frac{7}{12} = 8.4\\y*\frac{7}{12} = 8\frac{4}{10}\\y*\frac{7}{12} = 8\frac{2}{5}\\y = 8\frac{2}{5}:\frac{7}{12}\\y = 8\frac{2}{5}*\frac{12}{7}\\y = \frac{8*5+2}{5}*\frac{12}{7}\\y = \frac{42}{5}*\frac{12}{7}\\y = \frac{42}{5}*\frac{12}{7}\\y = \frac{504}{35}\\y = \frac{72}{5}\\y = 14\frac{2}{5}\\y = 14.4$