Question

calcular o valor das expressões numéricas, lembrando a ordem das operações:
a) 4/7 - 1/7 × 4=
b) 1/6+20/9×3/4 - 2/5×5/2=

Answer 1

$a) \\ \frac{4}{7} - \frac{1}{7} \times4= \\ \\ \frac{4}{7} - \frac{4}{7} = \frac{4-4}{7} = \frac{0}{7} =0 \\ \\ \\ b) \\ \frac{1}{6} + \frac{\not20^5}{\not9_3} \times \frac{\not3}{\not4} - \frac{\not2}{\not5} \times \frac{\not5}{\not2} = \\ \\ \frac{1}{6} + \frac{5}{3} -1= \\ \\ \frac{1+10-6}{6} = \frac{11-6}{6} = \frac{5}{6}$

Answer 2

A)4/7-1/7X44/7- 4/7=0/7=0B)1/6+20/9x3/4-2/5x5/21/6+60/36-10/101/6+10/6-1=11/6-111-6/6=11/6