👤

S1=1-2+3-4+5...+99-100
S2=-2-4-6...-98-100


Răspuns :

S1= (-1)+(-1)+(-1)...+(-1)
S1= (-1) * 50
S1= -50

S2= (-2) (1 +2+3+...+50)
S2=(-2) (50*51/2)
S2 = - 2550