2²º-1-2-2²-2³-...-2ˆ19
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2²º-1-2-2²-2³-...-2ˆ192²º-1-2-2²-2³-...-2ˆ192²
2²º-1-2-2²-2³-...-2ˆ19
2²º-1-2-2²-2³-...-2ˆ19
2²º-1-2-2²-2³-...-2ˆ19
2^20-1-2-2^2-2^3-…2^19
=2^20-(1十2十2^2十2^3…十2^19)
=2^20-(1-2^19)/(1-2)
=2^20-2^19十1
=2^19十1