40¹ × 20²
= 2 × 20 × 20²
= 2 × (20²+¹)
= 2 × 20³
= 2 × 8.000
= 16.000
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40¹ × 20²
= 2 × 20 × 20²
= 2 × (20²+¹)
= 2 × 20³
= 2 × 8.000
= 16.000