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calculați 2 +4+6+.......+100-(1+3+5...+99)​

Răspuns :

Răspuns:

N=(99-1):2+1

N=98:2+1

N=49+1

N=50

S=(99+1)*50:2

S=100*25

S=2500

S=(100+2)*50:2

S=102*25

S=2550

2550-2500=550