Question

Resolva as expressões: a) 2/4 + 3/8 : 42 = b) 16 + 28/10 – 31/8= c) 2 x̕√36 : (2 x 4²) + 3/5 :2/3 =

Answer 1

a)

2/4 + 3/8 : 42

= 1/2 + 3/8 . 1/42

= 1/2 + 3/42 (:14)/(:14) . 1/8

= 1/2 + 1/14 . 1/8

= 1/2 + 1/112

Mmc (2,112) = 112

= (56+1)/112

= 57/112

b)

= 16 + 28/10 (:2)/(:2) – 31/8

= 16 + 14/5 - 31/8

MMC (8,5) = 40

= (40.16 + 8.14 - 5.31)/40

= (640 + 112 - 155)/40

= (640 - 43)/40

= 597/40

c)

= 2 .√36 : (2 x 4²) + 3/5 :2/3

= 2.6 : (2.16) + 3/5 . 3/2

= 12/32 (:4)/(:4) + 9/10

= 3/8 + 9/10

8,10: 2

2,5: 2

1,5: 5

1,1 = 2.2.5 = 40

= (5.3 + 4.9)/40

= (15+36)/40

= 51/40

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