1.phân tích thành nhân tử: a, 1/4 a ²-b ² b, 49-a^4b ² c, a ²x ²-1/4 b ² d, a^4-b^4 e 4p ²-9 f, c ²d^4 g, 81a ²b ²-9x ² h, (5a+3b) ²-25 i, (a+3y) ²-z ² k, a ²b-b ³(x+y) ² m, (xy) ²-(x-y) ² n, 1-(x-y) ² l, 16a ²-(x-y) ² p, (a-3b) ²-16c ² q, 9a ²+6ab+b ² u 1-a ³ v, 64x ³+1/8 w, a ³-27 y, x ³-3x ²+3x-1

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