Question

va rooogggg ajutatima​

Answer 1

Răspuns:

Explicație pas cu pas:

e)

{637 + 15 *[15 *(6 + 12) : 45 - 6] : 21} : 13

= [637 + 15*(15*18 : 45 - 6) : 21] : 13

= [637 + 15*(270 : 45 - 6) : 21] : 13

= [637 + 15*(6 - 6) : 21] : 13

= (637 + 15*0 : 21) : 13  

= (637 + 0) : 13

= 637 : 13

= 49

f)

6 + 12 + 18 + 24 + ... + 600 = 6*(1 + 2 + 3 + 4 + ... + 100)

= 6*100*101/2 = 6*50*101

3 + 6 + 9 + ... + 300 = 3*(1 + 2 + 3 + ... + 100)

= 3*100*101/2 = 3*50*101

1 + 2 + 3 + ... + 100 = 100*101/2 = 50*101

(6*50*101)^2 : (3*50*101) : (50*101)

= 6^2*50^2*101^2 : (3*50*101) : (50*101)

= 36 : 3

= 12