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1) x^3 -18x+27 =0
2) 7x^3-12x^2-8=0
3) x^3+2a.x^2+ a^2.x+a-1=0
4) 4.a^2.x^3-(4.a^2 +1)x +2a=0
5) 2.x^4+11.x^2+5=0
6) x^4 -(m^2 +4)x^2 +4.m^2 =0
Mong mọi người giúp đỡ!!! :r2