Question

va rog URGENT DAU COROANA
doar punctele c) si d)

Answer 1

c) ( - 1 - 2 - ......- 1 250 ) : ( - 625 ) =

= - 1 × ( 1 + 2 + .........+ 1 250 ) : ( - 1) × 625 =

→ am dat factor comun pe ( - 1 ) ; aplic formula sumei lui Gauss

= ( 1 250 × 1 251 : 2 ) : 625 =

= 625 × 1 251 : 625 =

= 1 251

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d) ( - 6 - 12 - 18 - .......- 1 080 ) : ( - 2 - 4 - ......- 360 ) = 3

= ( - 6 ) × ( 1 + 2 + 3 + .......+ 180 ) : ( - 2 ) × ( 1 + 2 + 3 + .....+ 180 ) =

= ( - 6 ) : ( - 2 )

= 3