b2=1/5 b4=0.375найти b1 и q

q²=b4/b2=3/8:1/5=3/8*5=15/8q=√(15/8)=√30/4 U q=-√30/4b1=b2/qb1=1/5:√30/4=1/5*4√30/30=2√30/45 U b1=-2√30/15