Tìm x biết: (x−1)(x2+x+1)+x(x+2)(2−x)=5, (2x+1)(4x2−2x+1)−8x(x2+2)=1
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Bài 9: Tìm x biết:
1) (x−1)(x2+x+1)+x(x+2)(2−x)=5
2) (2x+1)(4x2−2x+1)−8x(x2+2)=1
3) (x+1)(x2−x+1)−x(x−2)(x+2)=2
4) (x−3)(x2+3x+9)=x(x2−8)
5) (x−1)3−(x+3)(x2−3x+9)+3(x2−4)=2