Question

44+45+46+....+99
am nevoie urgent!!​

Answer 1

Răspuns:

Explicație pas cu pas:

44 + 45 + 46 + ..... + 99 = 4004

(99-44)+1 = 55 + 1 = 56 termeni are suma

= 56 × ( 44 + 99 ) : 2 =

= 28 × 143 =

= 4 004

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• al doilea mod: adăugăm primele 43 de numere consecutive, apoi le scădem

(1+2+3+..........+ 99 ) - ( 1+2+3+........+43) = 4004

= 99 × (1+99) : 2 - 43 × (1+43) : 2 =

= 99 × 100 : 2 - 43 × 44 : 2 =

= 99 × 50 - 43 × 22 =

= 4950 - 946 =

= 4004

Answer 2

Salut! :)

44 + 45 + ... + 99 =

99 × 100 : 2 - 43 × 44 : 2 =

99 × 50 - 43 × 22 =

4950 - 946 = 4004