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Delialazaugabriela12
a fost răspuns

5+6+7...+56=
Repede dau coroana

Răspuns :

5+6+7+...+56
56+55+54+...+5
61+61+61+...+61
=(56-5): 1+1
52
S=61•52:2
Andreutzakriss

5+6+7+...+56=(1+2+3+...+56)-(1+2+3+4)=

=56·57/2-10=1586

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