Question

Определи неизвестное вычитаемое!
1 целая 1/10-р=7/20.
р=? Запиши несократимую дробь

Answer 1

Ответ:   $\displaystyle\\p=\frac{15}{20}$     ! в несократимом виде !

$\displaystyle\\1\frac{1}{10}-p=\frac{7}{20}\\\\\\-p=\frac{7}{20}-1\frac{1}{10}\\\\\\-p=\frac{7}{20} -\frac{11}{10}\\\\\\-p=\frac{7}{20}-\frac{22}{20}\\\\\\-p=-\frac{15}{20} \\\\\\p=-\frac{15}{20}*(-1)\\\\\\p=\frac{15}{20}$

Проверка:

$\displaystyle\\1\frac{1}{10}-\frac{15}{20}=\frac{7}{20}\\\\\\\frac{11}{10}-\frac{15}{20}=\frac{7}{20}\\\\\\\frac{22}{20}-\frac{15}{20}=\frac{7}{20}\\\\\\\frac{7}{20}=\frac{7}{20}$