Bài 1: Phân tích đa thức thành nhân tử a, 3x+6x ² b,9x(x+6)-3(6+x) c, 5x(x-2) ²-10(2-x bài 2 Sử dụng hằng đẳng thức a,25x ²y ² b, -1/4 ²+1+x c,9x^4y ²-6xy+1

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