a) 2x ³ - 7x ² + 7x -2 =0 b) (x ² + 3x +1 ) (x+1) (x+2) =30 c) x mũ 4 - 2x ³ -3x ² +4x+4=0 d) x(x+2) ( x+3) ( x+5) +8= 0 e) ( 2x ² +3x +1 ) ² - 4x ² -6x=26 h) ( 3X +1) ³ + ( 4x -3) ³ + (2 - 7x) =0

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