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a10= 24
a1 × √2⁹ = 24
a1=24÷16√2
a1= ¾√2
a4 = ¾√2 × √2³
a4= 3
a9=0.28
a13=175
a1 × q⁸ = 0.28
a1 × q¹² = 175
dzielimy rownania przez siebie
1/q⁴=0.0016
q=5
a10=a9 × 5
a10= 1.4