(1/8+3/4)*16 (12 1/2:2 1/2)-6 2:2/3*1 1/2 3/4*5/7+3/4*2/7

Решите задачу:

$( \frac{1}{8} + \frac{3}{4} ) \times 16 = ( \frac{3 + 6}{24} ) \times 16 = \frac{9 \times 16}{24} = 6$
$(12 \frac{1}{2} \div 2 \frac{1}{2} ) - 6 = 12.5 \div 2.5 - 6 = 5 - 6 = - 1$
$2 \div \frac{2}{3} \times 1 \frac{1}{2} = \frac{2 \times 3}{2} \times \frac{3}{2} = \frac{9}{2} = 4.5$
$\frac{3}{4} \times \frac{5}{7} + \frac{3}{4} \times \frac{2}{7} = \frac{15}{28} + \frac{6}{28} = \frac{21}{28} = \frac{3}{4} = 0.75$