Calcule e simplifique até não ser possível
a) 7/4 + 2/4
b) 3/5 + 1/2
c) 12/7 - 5/6
d) 1/8 + 3/2 - 1/4
e) 2/3 + 1/2 - 3/6
f) 8/9 . 18/10
g) 6/5 . 10/12 . 5/4
h) 12/7 : 24/14
i) (1/2 . 2/4) + (7/4 : 7/2)
a) 7/4 + 2/4
b) 3/5 + 1/2
c) 12/7 - 5/6
d) 1/8 + 3/2 - 1/4
e) 2/3 + 1/2 - 3/6
f) 8/9 . 18/10
g) 6/5 . 10/12 . 5/4
h) 12/7 : 24/14
i) (1/2 . 2/4) + (7/4 : 7/2)
Lista de comentários
a) 7/4 + 2/4 = 9/4
b) 3/5 + 1/2 = 6/10 + 5/10 = 11/10
c) 12/7 - 5/6 = 72/42 - 35/42 = 37/42
d) 1/8 + 3/2 - 1/4 = 1/8 + 12/8 - 2/8 = 11/8
e) 2/3 + 1/2 - 3/6 = 4/6 + 3/6 - 3/6 = 4/6 = 2/3
f) 8/9 * 18/10 = (8*18)/(9*10) = 144/90 = 8/5
g) 6/5 * 10/12 * 5/4 = (6*10*5)/(5*12*4) = 60/48 = 5/4
h) (12/7) / (24/14) = (12/7)*(14/24) = 1
i) (1/2 * 2/4) + (7/4 / 7/2) = 1/4 + 1/2 = 1/4 + 2/4 = 3/4