Toán Lớp 8: 16-16x+4x^2
x^2-y^2
1-3x+3x^2-x^3
8x^3+12x^2+6x+1
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Toán Lớp 8: 16-16x+4x^2
x^2-y^2
1-3x+3x^2-x^3
8x^3+12x^2+6x+1
Comments ( 2 )
= 4(4-4x+x^2)
=4(x^2-4x+4)
=4(x-2)^2
x^2-y^2
=(x-y)(x+y)
1-3x+3x^2-x^3
=x^3-3x^2+3x-1
=(x-1)^3
8x^3+12x^2+6x+1
=(2x+1)^3