Question

Вычислите:
а)7/12 + 5/12
б)21/14 - 9/14
в) 29/47 + ( - 31/47)
г) - 25/39 - ( - 18/39)

Answer 1

Пошаговое объяснение:

а) $\frac{7}{12}$ + $\frac{5}{12}$ = $\frac{7+5}{12}$= $\frac{12}{12}$ = 1

б) $\frac{21}{14}$ - $\frac{9}{14}$ = $\frac{21-9}{14}$ = $\frac{12}{14}$ = $\frac{6}{7}$

в) $\frac{29}{47}$ - $\frac{31}{47}$ = $\frac{29-37}{47}$ = $\frac{-2}{47}$ = -$\frac{2}{47}$

г) $\frac{18}{39}$ - $\frac{25}{39}$ = $\frac{18-25}{39}$ = $\frac{-7}{39}$ = -$\frac{7}{39}$