Sagot :
4n ile 9 n yi toplarsak 13 n olur.3 ile 8 i toplarsak 11 olur.13n+11 olur.eksi artıya dönüsür.n -n olur.-1 +1 olur.(13n+11)+(-n+1)= 13-1=12n 11+1=12 olur.12÷12=1
n=1
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