Question

calcule as frações com o mesmo denominador:

a) 52/10 + 4,8 =


b)0,7 + 1,8 + 0,5 =


c) 0,57 - 0,90 + 0,63 =


d) 18/10 + 16/10 + 12/10 - 12/10 - 12/10


calcule as frações com denominadores diferentes:


a) 4/5 + 1,5 =


b 2/3 + 8/6 - 3/2 =


c)- 0,9 + 1,6 - 6/10 =


d) 2/10 + 4/5 + 7/8 -14/10 =​

Answer 1

Resposta:

a) 100/10

b)30/10

c) 30/100

d) 22/10

a) 23/10

b) 3/6

c) 1/10

d) 19/10

Explicação:

a) 52/10+4,8 =

52/10+48/10 =

52+48/10 =

100/10

b)0,7+1,8+0,5 =

7/10+18/10+5/10 =

7+18+5/10 =

25+5/10 =

30/10

c) 0,57-0,90+0,63 =

57/100-90/100+63/100 =

57-90+63/100 =

-33+63/100 =

30/100

d) 18/10+16/10+12/10-12/10-12/10 =

18+16+12-12-12/10 =

18+16-12/10 =

34-12/10 =

22/10

a) 4/5+1,5 =

4/5+15/10 =

(10÷5×4)+(10÷10×15)/10 =

(2×4)+(1×15)/10 =

8+15/10 =

23/10

b) 2/3+8/6-3/2 =

[6÷3×2]+[6÷6×8]+[6÷2×(-3)]/6 =

[2×2]+[1×8]+[3×(-3)]/6 =

4+8+[-9]/6 =

4+8-9/6 =

12-9/6 =

3/6

c) -0,9+1,6-6/10 =

-9/10+16/10-6/10 =

-9+16-6/10 =

7-6/10 =

1/10

d) 2/10+4/5+7/8-14/10 =

[40÷10×2]+[40÷5×4]+[40÷8×7]+[40÷10×(-14)]/10 =

[4×2]+[8×4]+[5×7]+[4×(-14)]/10 =

8+32+35+[-56]/10 =

8+32+35-56/10 =

40+35-56/10 =

75-56/10 =

19/10