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V rog mult ajutati-ma e  cu suma aia lui Gauss:
efectuati:
a) x²+2x²+3x²+...+10x²-2x-4x-6x-...-20x=
b)5a+10a+15a+...+60a+3b+6b+9b+...+3b=
c)(4x-b²)+(8x-2b²)+(12x-3b²)+(16x-4b²)+(20x-5b²)=
 
vA  ROG AJUTATI-MA!!