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= (1+99)+(3+97)+(5+95) +...+ (45+55)
= (100) +(100)+(100) +....+(100)
= 25(100)= 2.500
b)
(1+3+5+...+99) - (2+4+6+...+100)
= 2500 - 2.550
= - 50
c) -(100+99+98+...+0) + (1+2+3+...+50)
= - (100+99+98+...+51)
= - (3375)
= - 3375