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thuylinh.18.02.2001
2 năm trước
bài 2: khai triển các hằng đẳng thức sau: a, (x ^ 2 -2y) bình phương b,(2x^ 2-y ^ 2)bình phương c,(2x^2.y-3y^2.x)bình phương c, (-5-2x) bình phương
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