Toán Lớp 8: a) x^2 – 4x + 4
b) x^2 – 2
c) 1 – 8x^3
d) 5x^3 + 10x^2y + 5xy^2
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Toán Lớp 8: a) x^2 – 4x + 4
b) x^2 – 2
c) 1 – 8x^3
d) 5x^3 + 10x^2y + 5xy^2
Phân tích đa thức
Comments ( 2 )
a) x² – 4x + 4
= x² – 2.x.2 + 2²
= (x-2)²
b) x² – 2
= x² – (√2)²
= (x-√2)(x+√2)
c) 1 – 8x³
= 1³ – (2x)³
= (1-2x)(4x² + 2x + 1)
d) 5x³ + 10x²y + 5xy²
= 5x(x² + 2xy + y²)
= 5x(x + y)²