Giai ho minh pt nay nha?

1. x^4 - 4x - 1 = 0

2.x^2 + 9.x^2 : (x+3)^2 = 16 là x mũ 2 cộng với 9x bình trên(x+3) bình = 16

3. (x+3)^4 + ( x^2 + x - 6 )^2 = 2.(x-2)^4

4. x^4 - 2x^2 - 400x = 9999

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