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a5=a1*q^4
-3/128=a1*(1/2)^4
-3/128=a1*1/16
a1=-3/128*16/1
a1=-3/8
a2=-3/8*q=-3/8*1/2=-3/16
a3=-3/8*q²=-3/8*1/4=-3/32
a4=-3/8*q³=-3/8*1/8=-3/64