Question

CALCULE O VALOR DAS EXPRESSÕES

(A) 2/5 + 1/2 - 1/3
(B) 3/4 : 1/2 × 2/3
(C) 2/4 × 5/6 + 1/2
(D) 2/3 + 1/4 × 3
(E) 3/5 + 1/5 : 1/10
(conta também, se conseguir)


​

Answer 1

Resposta:

A-

$\frac{2}{5} + \frac{1}{2} - \frac{1}{3} \\ \frac{4 + 5}{10} - \frac{1}{3} \\ \frac{9}{10} - \frac{1}{3} \\ \frac{27 - 10}{30} \\ \frac{17}{30}$

B-

$\frac{3}{4} \div \frac{1}{2} \times \frac{2}{3} \\ \frac{3}{4} \times \frac{2}{1} \times \frac{2}{3} \\ \frac{6}{4} \times \frac{2}{3} = \frac{12}{12} = 1$

C-

$\frac{2}{4} \times \frac{5}{6} + \frac{1}{2} \\ \frac{10}{24} + \frac{1}{2} = \frac{10 + 12}{24} = \frac{22}{24} \div 2 = \frac{11}{12}$

D-

$\frac{2}{3} + \frac{1}{4} \times 3 \\ \frac{2}{3} + \frac{3}{4} = \frac{8 + 9}{12} = \frac{17}{12}$

E-

$\frac{3}{5} + \frac{1}{5} \div \frac{1}{10} \\ \frac{3}{5} + \frac{1}{5} \times \frac{10}{1} \\ \frac{3}{5} + \frac{10}{5} = \frac{3 + 10}{5} = \frac{13}{5}$