(3×10∧-5)÷(6×10∧-2),

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(3×10∧-5)÷(6×10∧-2),

(3×10∧-5)÷(6×10∧-2)
=(3÷6)×(10^-5÷10^-2)
=0.5×10^-3
=5×10^-4