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Quynhnhu79
2 năm trước
Đề bài: Viết các biểu thức dưới dnagj bình phương của 1 tổng hoặc hiệu: a) x^2+8x+16 b) 9x^2-24x+16 c) x^2-3x+9/4 d) 4x^2 y^4-4xy^3 +y^2 e) (x-2y)^2 -4(x-2y) +4 f) (x+3y)^2 -12xy
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