HSG 8 Bài thuyết trình

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HSG 8 - HẰNG ĐẲNG THỨC

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1.HĐT CƠ BẢN

HS ghi lại và học thuộc.

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* Hướng dẫn chứng minh

$>\left(a+b+c\right)^3-a^3-b^3-c^3=$
$\left(\left(a+b+c\right)-a\right)\left(...\right)-\left(b+c\right)\left(...\right)$

>a^3+b^3+c^3-3abc=\left(a+b\right)^3-3ab\left(a+b\right)+c^3-3abc

=\left(a+b\right)^3+c^3-3ab\left(a+b+c\right)=\left(\left(a+b\right)+c\right)\left(....\right)-3ab\left(a+b+c\right)

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2. HDT MỞ RỘNG

Chứng minh lại công thức khi (1) và (4) của HDT mở rộng bậc ba khi sử dụng

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3.Hệ quả HDT mũ 2

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4.Hệ quả HDT bậc 3

HSG 8 - HẰNG ĐẲNG THỨC

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