Question

Calcule:

a)5/10×20/7=

b)1/5+2/3+6/15=

c)2/5-1/2-4/8=

d)12/15-8/10=

e)5/9-4/5+3/2=​

Answer 1

Resposta:

Explicação passo-a-passo:

Calcule:

a)5/10 (:5)/(:5) ×20/7

= 1/2 . 20/7

= 20/2 .1/7

= 10 . 1/7

= 10/7

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b)1/5+2/3+6/15 (:3)/(:3)

= 1/5 + 2/3 + 2/5

= 3/5 + 2/3

= (3.3 + 5.2)/15

= (9+10)/15

= 19/15

_________

c)2/5 - 1/2 - 4/8 (:4)/(:4)

= 2/5 - 1/2 - 1/2

= 2/5 - 2/2

= 2/5 - 1

= (2 - 5.1)/5

= (2-5)/5

= - 3/5

d)12/15 (:3)/(:3) - 8/10 (:2)/(:2)

= 4/5 - 4/5

= 0

e)5/9-4/5+3/2

Mmc = 90

= (10.5 - 18.4 + 45.3)/90

= (50 - 72 + 135)/90

= (185 - 72)/90

= 113/90

9,5,2: 2

9,5,1: 3

3,5,1: 3

1,5,1: 5

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1,1,1

= 2.3.3.5

=​ 6.15

= 90