Question

Calcule as expressões numéricas e,quando possível,simplifique as frações,tornando-as irredutíveisso.

A)-2/5+(-1/3)
B)24-7/2
C)2,3+7,5-3,6-2,9
D)3/5-2+1/5
E) (1/4+1/3)-(-1/6+1/2)-3
F)0,3+(2/3-1/5)+2 1/2
G)-4/5-(0,8-0,36)
H)12/5-(-1)+(-3,6+5,4)

Answer 1

a) - 2/5 + ( - 1/3) =
 = - 2/5 - 1/3 =
 = - 6/15 - 5/15=
 = 11/15

b) 24 - 7/2=
 = 48/2 - 7/2 =
 = 41/2

c)2,3 + 7,5 - 3,6 - 2,9 =
 = 9.8 - 6,5=
 = 3,3

d)3/5 - 2 +1/5 =
 = 3/5 - 10/5 + 1/5 =
 = - 6/5

e) ( 1/4+1/3) - ( - 1/6 + 1/2) - 3 =
 = ( 3/12 + 4/12) - ( - 1/6 + 3/6) - 3 =
 = (7/12) - (2/6) - 3 =
 =  7/12 - 2/6 - 3 =
 =  7/12 - 4/12 -36/12 =
 = 7 / 12 -40/12=
 = - 33/12

f) 0,3 + ( 2/3 - 1/5) + 21/2 =
 = 3/10 + (10/15 - 3/15) +21/2 =
  = 3/10 + 7/15 + 21/2 =
 = 9/30  + 14/30 + 315/30=
= 338/30=
=169/15

g)- 4/5 - ( 0,8- 0,36) =
 = - 4/5 - ( 0,44)=
 = 4/5 - 0,44 =
 = 0,8 - 0,44 =
 = 0,36

h) 12/5 - (-1) + ( - 3,6 + 5,4) =
 =  2,4 +1 + 1,8 =
 = 5,2