Toán Lớp 8: chứng minh đẳng thức sau
a^3-b^3=(a-b)^3+3ab(a-b
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Toán Lớp 8: chứng minh đẳng thức sau
a^3-b^3=(a-b)^3+3ab(a-b
Comments ( 2 )
$=a^3-3a^2b+3ab^2-b^3+3a^2b-3ab^2$
$=a^3-b^3(đpcm)$