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Andrei2006bv
a fost răspuns

Ma puteti ajuta cu 2 exe?
S=4+8...124+128
S=1+2+...+123

Răspuns :

STARPLAY829
1) S=4+8+...+128
(128-4)÷4+1=124÷4+1=31+1=32 termeni
S=[32×(128+4)]÷2
S=(32×132)÷2
S=32×66=2112
2)S=1+2+...+123
(123-1)÷1+1=123 termeni
S=[123×(123+1)]÷2
S=(123×124)÷2
S=123×62=7626

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