Question

Resolva as expressões envolvendo duas operações:
a)3/4 × 1/2 + 2/3=
b)(5/7 + 1/2) ÷ 3/4=
c)[(1/5 ÷ 3/8) + 1/4] × 2/7=
d)(7/4 ÷ 3/8) - 1/2=

Answer 1

Olá
a)3/4x1/2+2/3 =
3/8 + 2/3==o mmc de 8 e 3 = 24
9/24 +16/24=
25/24

b)(5/7+1/2):3/4==o mmc de 7e 2=14
10/14+7/14:3/4
17/14:3/4
17/14x4/3
68/42==por 2
34/21

c) [(1/5:3/8)+1/4]x2/7
[1/5x8/3+1/4]x2/7
[8/15+1/4]x2/7  o mmc de 15 e4=60
32/60+15/60x2/7
47/60x2/7
94/420==por 2
47/210

d)(74:3/8)-1/2
7/4x8/3-1/2
56/12-1/2==mmc de 12 e 2 = 12
56/12 -6/12
50/12===por 2
25/6

Bons estudos.