Toán Lớp 7: Câu1: x^2-4x-4y^2+4
Câu 2: 2x^3-2x^2+3x-5
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Toán Lớp 7: Câu1: x^2-4x-4y^2+4
Câu 2: 2x^3-2x^2+3x-5
Comments ( 1 )
x^2-4x-4y^2+4
=(x^2-4x+4)-4y^2
=(x^2-2×2+2^2)-4y^2
=(x-2)^2 – (2y)^2
=(x-2-2y)(x-2+2y