Question

8.Calculeaza : c) 2+4+6+....100 ; d) 1+3+5+.....+99 (suma lui Gauss) REPEDE.


DAU COROANA ​

Answer 1

Explicație pas cu pas:

c) 2+4+6+......+100=2×1+2×2+2×3+.........2×50=2×(1+2+3+...+50)=2×54=108

Answer 2

Răspuns:

c) =2(1+2+3+,,,,,50)=2((50x51):2)=2x1275=2550

d). 3=2+1

5=4+1

7=6+1

---------

99=98+1

adunam toate sumele

1+3+....+99=1+2+1+4+1+.....98+1

=50x1+2+...+98

=50+2(1+...+49)

            suma Gauss

=50+2(49x50/2)=....50 la2=2500

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