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q=-2/4=-1/2
a3=a1*q^2
a1*1/4=4 /*4
a1=16
4*q=-2
q=-1/2
oznaczmy:
a-wyraz pierwszy
b-wyraz drugi
b*q=4
b*-1/2=4
b=-8
a*q=-8
a*-1/2=-8
a=16