b7=b5*q²
0,005=0,5*q²⇒q²=0,005/0,5=0,01⇒q= 0,1 q=-0,1
b5=b1*q^4
0,5=b1*0,1^4⇒b1=0,5/0,0001=5 000
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b7=b5*q²
0,005=0,5*q²⇒q²=0,005/0,5=0,01⇒q= 0,1 q=-0,1
b5=b1*q^4
0,5=b1*0,1^4⇒b1=0,5/0,0001=5 000