Toán Lớp 8: 7x^2-14x+7
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Toán Lớp 8: 7x^2-14x+7
Phân tích thành đa tử
Comments ( 2 )
=7x^2-7.2x+7
=7.(x^2-2x+1)
=7.(x^2-2.x.1+1^2)
=7.(x-1)^2