Question

1) Calcule:

Dois terços de 900 =

Três quartos de 160 =

2) Se A = – 3/7, B = 5/2, C = –13/14 e D = – 3, calcule os valores de: 

a) (A + B) – C =     

b) (– A + B) – D =     

c) (A – B) – (C – D) = 

Answer 1

1 a) 900/3x2= 600
   b) 160/4x3= 120
2 a) (-3/7 + 5/2) - 13/14= 28/14 ou 2 inteiros mmc de 7, 2, 14 = 14
   b) (-3/7 + 5/2) - 3/1 = -13/14
   c) (3/7 - 5/2)-(-13/14- 3/1) = 26/14 ou 1 inteiro e 2/14

Answer 2

1)
a)
$\frac{2}{3} * \frac{900}{1} = \frac{1800}{3} = 600$

b)
$\frac{3}{4} * \frac{160}{1} = \frac{480}{4} = 120$

2) A = -$\frac{3}{7}$ B=$\frac{5}{2}$ C=$-\frac{13}{14}$D=-3
a)
$\frac{29}{14}$ - 3 = $- \frac{13}{14}$

b)
$\frac{83}{14}$

c)
$- \frac{41}{14}$ - $\frac{29}{14}$ = $-\frac{71}{14} = -5$