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Anonymous10000
a fost răspuns

a)3+6+9...+72
b)4+8+12...+84
c)6+12+18...+120

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Răspuns :

CristianaMaria11
a) 3+6+9+...+72
72+69+66+...3
S=75+75+75+...75
S=75•24
S=1300
b) 4+8+12+...+84
84+80+76+...+4
S=88+88+88+...+88
S=88•84
S=7392
c)6+12+18+...+120
120+114+108+...+6
S=126+126+126+...+126
S=126•120
S=15120

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