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Phân tích đa thức nhân tử (một số bản) 1- 5x2 + 25x + 20 2- 3x2 – 5x + 3- x2 – 4x + 4- 3x2 – 5x - 5- 2x2 – 10x + 6- x2 – 5x + 7- x2 – 5x - 8- 3x3 – 81 9- 3x2 – 7x + 10- 5x2 – 3x - 11- x6 + 27 12- x4 + 13- x3 – 14- x2 – 4x + + (x +y)2 - 2(x-2)(x+y) 15- x3 – 6x2 + 12x – 16- 3x2 – 12 17- 3x2 – 8x + 18- 5x2 – 125 19- 27x3 + 27x2 + 9x + 20- x3 + 125 21- x2 + 6x – 22- x2 + 6x + 23- x2 + 6x + 24- x4 – 64 25- x4 + 64 26- (x-1)2 – (x + 2)2 27- (x-1)3 – (x + 1)3 28- (x-1)2 + (x + 2)2 - 2(x2 + x - 2) 29- 5x3 – 625 30- (x-1)2 + (x + 1)2 - 2x2 +