Sagot :
Cevap:
kabk foto yok
Adım adım açıklama:
ben göremiyorum sizde öyle mi
Cevap:
Adım adım açıklama:
S10= a+ a+k + a+2k +... +a+9k =10a+45k
S20= a+ a+k + a+2k + ...+a+19k = 20a+190k
10a+45k=40
20a+190k=280
20a+90k=80
20a+190k=280
-___________
-100k=-200 => k=2 =>a=-5
İlk terim -5 tir.
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