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23+24+25+......122-7*11=x+23*47-23*46 care este rezultatul

Răspuns :

Icecon2005
23+24+25+......122-7*11=x+23*47-23*46

23+24+25+......122-progresie aritmetica

an=a1+(n-1)×r
122=23+(n-1)×1
122=23+n-1
122-23+1=n
100=n
S=[(a1+an)×n]:2=(122+23)×100]:2=7250
7×11=77
23×47-23×46=23(47- 46)=23
7250-77 = x+23
7173 - 23 = x
x=7150