Calcule:
a) 3/7 + 11/7
b) 20/15 - 8/15
c) 3/5 + 1/3
d 5/10 - 3/2
e) 8/5 + 7/6
f) 5 + 1/4
g) 3/7 - 4
Soluções para a tarefa
Resposta:
Explicação passo a passo:
.
a) 3/7 + 11/7 = (3 + 11)/7 b) 20/15 - 8/15 =
. = 14/7 (20 - 8)/15 =
. = 2 12/15 = (simplifica por 3)
. 4/5
.
c) 3/5 + 1/3 = (m.m.c. = 15) d) 5/10 - 3/2 =
. 9/15 + 5/15 = 1/2 - 3/2 =
. (9 + 5)/15 = (1 - 3)/2 =
. 14/15 - 2/2 =
. - 1
.
e) 8/5 + 7/6 = (m.m.c. = 30) f) 5 + 1/4 = (m.m.c.= 4)
. 48/30 + 35/30 = 20/4 + 1/4 =
. (48 + 35)/30 = (20 + 1)/4 =
. 83/30 21/4
.
g) 3/7 - 4 = (m.m.c. = 7)
. 3/7 - 28/7 =
. (3 - 28)/7 =
. - 25/7
.
(Espero ter colaborado)