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Ajutatima va rog!! 3+6+9+.....................+180 

Răspuns :

Ramona19852007
3 +6+9+ ...........+180
n= ( 180 - 3) : ( 6-3) +1=
n=  177 : 3+1
n= 59+1
n=60

S= [( 180 + 3) ×60] : 2
S= ( 183 × 60 ) : 2
S = 10 980 : 2
S= 5490.
OliviaIngrid
S=suma
S=3+6+9+.........+180
S=180+177+.............+9+6+3
2S=183+183+.............183
(180-3):3+1=177:3+1=59+1=60 (termeni total) 
2S=183·60
S=183·60:2
S=10 980:2
S=5 490

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