Question

Resolva as expressões numéricas:
a) (-2/3) - (-1/2) + (1/6) • (2/3)
b) (-1/5) : (0,05) - (-7,5) • (-3,2)
c) (-1/8) : (-1/2) + (1/4) • (3/6)
d) (-0,7) • (-0,8) - (0,7) : (1,4)
e) (-5/7) • (1/4) - (5/4) • (2)
f) (1,2) • (1,3) - (3) : (2)​

Answer 1

Resposta:

A) (-2/3) (-1/2)= + 2/6= 1/3***

(1/6)/ (2/3) = 1/6 * 3/2 = 3/12 = 1/4 ****

reescrevendo

1/3+1/4=

mmc = 12

(4+3)/12 = 7/12 *****

B) (-1,5) / (0.05) = - 15/10 /5/100 = - 75 /

1000 = - 3/40 ***

(-7,5)* (-3.2) = - 75/10 * - 32/10 =

2400/100 = 24/1 ***

reescrevendo

(3/40) - (24/1) =

mmc = 40

(3- 960)/40= - 957/40 **** = 23 int 37/40 ****