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a+5b=22
-2b=-8
b=4
a+3.4=14
a+12=14
a=14-12=2
S3n/S2n=9/4
S12=12/2(4+11.4)=6.48=288
S8=8/2(4+7.4)=3.24=128
288:128=72:32=9:4
terbukti
maka n²-n+1=4²-4+1=16-4+1=12+1=13