(2-√3)^2017 × (2+√3)^2019 - 2×(1-√3/2)
= (2-√3)^2017 × (2+√3)^(2017+2) - (2-√3)
= (2-√3)^2017 × (2+√3)^2017 × (2+√3)² - (2-√3)
= [ (2-√3) × (2+√3) ]^2017 × (4+2√3) - (2-√3)
= [ 4-3 ]^2017 × (4+2√3) - (2-√3)
= 1^2017 × (4+2√3) - (2-√3)
= 1×(4+2√3) - (2-√3)
= 4+2√3 - 2+√3
= 2 + 3√3
2的2020次方-2的2019次方
=2x2的2019次方-2的2019次方
=2的2019次方
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