7/8+x=11/36 3/5умножить x=28/45 4/7:x=7/12

Решите задачу:

$\frac{7}{8} + x = \frac{11}{36} \\ \\ \ x = \frac{11}{36} - \frac{7}{8} \\ x= \frac{11}{4 \times 9} - \frac{7}{4 \times 2} \\ x = \frac{22 - 63}{4 \times 9 \times 2} \\ x = - \frac{41}{72}$
$\frac{3}{5} x = \frac{28}{45} \\ x = \frac{28}{45} \times \frac{5}{3} \\ x = \frac{28}{27} \\ x = 1 \frac{1}{27}$
$\frac{4}{7 } \div x = \frac{7}{12} \\ x = \frac{4}{7} \div \frac{7}{12} \\ x = \frac{4 \times 12}{7 \times 7} \\ x = \frac{48}{49}$