Question

Уравнение (1/4+1/5)х=2 1/4
Второй
(2 1/12-1 5/6)х=3/4

Answer 1

1)

$( \frac{1}{4} + \frac{1}{5} )x = 2 \frac{1}{4} \\ ( \frac{5}{20} + \frac{4}{20} )x = \frac{9}{4} \\ \frac{9}{20} x = \frac{9}{4} \\ x = \frac{9}{4} \div \frac{9}{20} = \frac{9}{4} \times \frac{20}{9} = \frac{20}{4} = 5 \\ x = 5$

2)

$(2 \frac{1}{12} - 1 \frac{5}{6} )x = \frac{3}{4} \\ (\frac{25}{12} - \frac{11}{6} )x = \frac{3}{4} \\ ( \frac{25}{12} - \frac{22}{12} )x = \frac{3}{4} \\ \frac{3}{12} x = \frac{3}{4} \\ x = \frac{3}{4} \div \frac{3}{12} = \frac{3}{4} \times \frac{12}{3} = \frac{12}{4} = 3$