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thừa số x3−27
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Solution
(x−3)(x2+3x+9)
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x3−27
Viết lại 27 dưới dạng 33
=x3−33
Áp Dụng Công Thức Hiệu Của Các Lũy Thừa Bậc Ba: x3−y3=(x−y)(x2+xy+y2)
x3−33=(x−3)(x2+3x+32)
=(x−3)(x2+3x+32)
32=9
=(x−3)(x2+3x+9)
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