Question

Помогите пожалуйста решить примеры.спасибо.

Answer 1

1.

$1\frac{2}{3} - \frac{3}{4} \times \frac{2}{9} = 1 \frac{2}{3} - \frac{6}{36} = \frac{5}{3} - \frac{1}{6} = \frac{10}{6} - \frac{1}{6} = \frac{9}{6} = \frac{3}{2} = 1 \frac{1}{2}$

$2 \frac{1}{2} \times 4 - 5 \frac{1}{4} = \frac{5}{2} \times 4 - \frac{21}{4} = \frac{20}{2} - \frac{21}{4} = \frac{40}{4} - \frac{21}{4} = \frac{19}{4} = 4 \frac{3}{4} = 4.75$

$3 \frac{1}{3} + 2 \frac{2}{9} \times \frac{9}{20} = \frac{10}{3} + \frac{20}{9} \times \frac{9}{20} = \frac{10}{3} + 1 = \frac{13}{3} = 4 \frac{1}{3}$

2.

$(2 \frac{1}{3} - 1 \frac{1}{2} ) \times 2 \frac{2}{5} = ( \frac{7}{3} - \frac{3}{2} ) \times \frac{12}{5} = ( \frac{14}{6} - \frac{9}{6} ) \times \frac{12}{5} = \frac{5}{6} \times \frac{12}{5} = \frac{12}{6} = 2$

$\frac{3}{7} ( 2 \frac{4}{9} + \frac{2}{3} ) = \frac{3}{7} ( \frac{22}{9} + \frac{6}{9} ) = \frac{3}{7} \times \frac{28}{9} = \frac{4}{3} = 1 \frac{1}{3}$

$( \frac{5}{12} \times \frac{1}{4} ) \times 12 = \frac{5}{48} \times 12 = \frac{5 \times 12}{48} = \frac{5}{4} = 1 \frac{1}{4} = 1.25$