Toán Lớp 8: Đẳng thức nào sau đây là Sai:
A) (x – y)3 = x3 – 3x2y + 3xy2 – y3 B) x3 – y3 = (x – y)(x2 – xy + y2)
C) (x – y)2 = x2 – 2xy + y2 D) (x – 1)(x + 1) = x2 – 1
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Toán Lớp 8: Đẳng thức nào sau đây là Sai:
A) (x – y)3 = x3 – 3x2y + 3xy2 – y3 B) x3 – y3 = (x – y)(x2 – xy + y2)
C) (x – y)2 = x2 – 2xy + y2 D) (x – 1)(x + 1) = x2 – 1
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