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2x=5
x=2,5
a₁·a₃=a₂²
x·10=5²
10x=25 |:10
x=2,5
Sposób II:
a₁=x, a₂=5, a₃=10
a₃:a₂=10:5=2
q=2
a₂:a₁=2
5:a₂=2
a₂=5:2=2,5