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GIAI BAI TOAN THEO NHIEU CACH
Đê bài : Phân tích A = xỶ- 4x +3 thành nhân tử
Cach 1:
A =(x°- 4x + 4)- 1=(x-2)-1=(x-2-1)(x-2+ DE (x -3)(x- 1)
Cach 2:
A=x’-14+4-4x=(x- 1)(x + 1)- 4(x- 1) =(x- 1)(x - 3)
Cach 3:
A=x’-9-4x+ 12=(x-3)(x + 3)- 4(x - 3) =(x - 3)(x +3 - 4) =(x -3)(x- 1) Cach 4:
A=x’-2x+1-2x+2=(x- 1)’-2(x- 1) =(x- 1)(x - 3)
Cách 5 :
A=x’-x-3x+3=x(x- 1)-3(x- 1) =(x- 1)(x -3)
Cach 6:
A =x’ -3x-x+3 =x(x-3)-(x- 3) =(x- 3\(x- 1)
Cach 7:
A = 4x’- 4x - 3x°+ 3 = 4x (x - 1) -3 (x’- 1) = 4x (x- 1) -3(x- IK +1)
=(x- 1) [4x - 3(x + 1)] = (x - 1) (4x - 3x - 3) =(«- 1)(« - 3)