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a fost răspuns

S=1+2+3+.....+65
S=1+2+3+.....+144
S=1+2+3+.....+680
S=8+9+10+....+254
S=43+44+45+....+190
S=2+4+6+....+260
va rog frumos urgent

Răspuns :

S=(65×66):2
S=(144×145):2
S=(680×681):2
S=(254×255):2
S=(190×191):2
S=(260×261):2
La prima (65x66)÷2
la a 2 a (144x145)÷2
la a 3 a (680x681)÷2

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