Question

1)calcule
a) 1/2+1/3+3/4

b) 3-1/2+1/4

c) 4/7+1/5+1/2

d) 1/2÷2/3-1/4
Me ajudem por favor

Answer 1

a)1/2 + 1/3 + 3/4 = 
m.m.c = 12
6/12 + 4/12 + 9/12 = 19/12

b)3 / 1 - 1/2 + 1/4 = 
m.m.c = 4
12/4 - 2/4 + 1/4 = 10/4 + 1/4 = 11/4

c)4/7 + 1/5 + 1/2 = 
m.m.c = 70
40/70 + 14/70 + 35/70 = 54/70 + 35/70 = 86/70 simplifica por 2 = 43/35

d)1/2 : 2/3 - 1/4 = 
1/2 x 3/2 - 1/4 = 
3/4 - 1/4 = 2/4 simplifica por 2 = 1/2