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[pe_kid_55]

1) $a^5-3a^4+4a^3-5a^2+3a-2$
2) $2x^2+x-6$
3) $x^4-4x^3+8x+3$
4) $15x^2+7x-2$

[Tru09]

1) $a^5-3a^4+4a^3-5a^2+3a-2$
2) $2x^2+x-6$
3) $x^4-4x^3+8x+3$
4) $15x^2+7x-2$

Chém nhanh
a,$a^5-3a^4+4a^3-5a^2+3a-2 =(a-2)(a^2+1)(a^2-a+1)$
b$2x^2+x-6 =(x+2)(2x-3)$
c $x^4-4x^3+8x+3 =(x-3)(x+1)(x^2-2x-1)$
d,$15x^2+7x-2 =(3x+2)(5x-1)$

Edited by Tru09, 26-08-2012 - 20:24.