Question

Efetue e simplifique:

a) 3/5+ 1/5 + 2/5 =
b) 1/8 + 3/8 + 2/8 =
c) 3/5 + 1/10 – 1/2 =
d) 7/4 + 3/8 + 1/2 =
e) 1/7 + 3/5 + 1/2 =
f) 3/10 + 1/5 + 5/2 =
g) 3/9 – 1/3 =
h) 5/12 + 3/4 + 1/3 – 1/4 =
i) 2/15 + 1/10 + 6/5 - 1/5 =
Me ajudem por favor......

Answer 1

a) 3/5+ 1/5 + 2/5 = 

3+1+2/5=
6/5

b) 1/8 + 3/8 + 2/8 = 

1+3+2/8=
5/8

c) 3/5 + 1/10 – 1/2 =

3*2/5*2 + 1/10 - 1*5/2*5=
5/10 + 1/10 - 5/10=
1/10
 
d) 7/4 + 3/8 + 1/2 = 

7*2/4*2 + 3/8 + 1*4/2*4=
14/8 + 3/8 + 4/8=
14+3+4/8=
21/8

e) 1/7 + 3/5 + 1/2 = 

1*5*2/7*5*2 + 3*7*2/5*7*2 + 1*5*7/2*5*7
10/70 + 42/70 + 35/70=
10+42+35=
87/70

f) 3/10 + 1/5 + 5/2 =

3/10 + 1*2/5*2 + 5*5/2*5=
3/10 + 2/10 + 25/10=
3+2+25/10=
30/10=
3
 
g) 3/9 – 1/3 =

3/9 - 1*3/3*3=
3/9 - 3/9=
0
 
h) 5/12 + 3/4 + 1/3 – 1/4 = 

5/12 + 3*3/4*3 + 1*4/3*4 + 1*3/4*3=
5/12 + 9/12 + 4/12 + 3/12=
5+9+4+3/12=
21/12

i) 2/15 + 1/10 + 6/5 - 1/5 =

2*2/15*2 + 1*3/10*3 + 6*6/5*6 - 1*6/5*6 =
4/30 + 3/30 + 36/30 + 6/30=
4+3+36+6/30=
49/30