Bài 3. Giải các phương trình sau: a) (3x + 2)²-(3x - 2)² = 5x+38 (x+3)²-(x-3)²=6x+18 c) e) (x+1)(x²-x+1)-2x=x(x-1)(x+1) ĐS a) x=2 b) x=2 c) x = 3 b) 3(x-2)² +9(x-1)=3(x²+x-3) d)(x−1)3 − x +1)2 =5 (2 − 1)-11(x+2) f)(x-2)³+ (3x-1)(3x + 1) = (x+1)³ 10 d) x=-7 e) x=1 9
