cho bieu thuc (1+x+x^2+x^3+….+x^2019)^2020=a0+a1x+a2X^2+……+a4078340x^4078340. Rút gọn bt: P=2020C0.a2020-2020C1a2019+2020C2.a2018-…….-2020C2019a1+2020
cho bieu thuc (1+x+x^2+x^3+….+x^2019)^2020=a0+a1x+a2X^2+……+a4078340x^4078340. Rút gọn bt: P=2020C0.a2020-2020C1a2019+2020C2.a2018-…….-2020C2019a1+2020
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