由二项展开式得:
(1-2X)^5
=1-10x+40x²-80x^3+80x^4-32x^5
∴ cx²=40x²
故 c=40
(1-2X)^5＝a＋ bX＋ cX^2＋ dX^3＋ eX^4 ＋fX^5,求c
2个回答
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