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Ion9978
a fost răspuns

10. Calculcazā sumele.
a) S, = 2 + 4 +6 + 8 + ... + 50 =
b) S, = 2 +4 +6 + 8 + ... + 100 =
c) S, = 10 + 20 + 30 + 40 + ... + 100 =
d) S = 1 + 3 + 5 + ... +49 =​

Răspuns :

Salutare2010

a) (2+50)×25:2=52×25:2=1300:2=650

b) (2+100)×50:2=102×50:2=102×25=2550

c) (10+100)×10:2=110×10:2=110×5=550

d) (1+49)×49:2=50×49:2=2450:2=1225

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