Question

resolva:

a) 2/7 : 11/8

b) 7/11 +2/33

c) 7/12 - 25/3

d) 8/9 . 7/24

e) 7/12 : 2/9

f) 25/17 +4

g) 82/17 - 14

Answer 1

a)
= 2/7 : 11/8
= 2/7 . 8/11
= 16/77

b)
= 7/11 +2/33

MMC (11,33) = 33

= (3.7 + 1.2)/33
= (21+2)/33
= 23/33

c)
= 7/12 - 25/3

MMC (3,12) = 12

= (1.7 - 4.25)/12
= (7 - 100)/12
= - 93/12

d)
= 8/9 . 7/24
= 8/24 (:8)/(:8) . 7/9
= 1/3 . 7/9
= 7/27

e)
= 7/12 : 2/9
= 7/12 . 9/2
= 63/24 (:3)/(:3)
= 21/8

f)
= 25/17 +4

MMC = 17

= (1.25 + 17.4)/17
= (25 + 68)/17
= 93/17

g) 82/17 - 14

MMC = 17

= (1.82 - 17.14)/17
= (82 - 238)/17
= - 156/17