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S100=100/2 (2.2+99.2)
S100=50 (4+198)
S100=50.202
S100=10100
Seperti itu mungkin.
s50= 50/2(2+100)=2550
B. -1+49x-1= -50
C. Sn = n/2(a+Un)
S199 = 199/2 (-100+99)=-199/2