May 2021 4 182 Report
jup minh` nhe' bai` tim` x:?

1) x (x – 5) – 4x + 20 = 0

2) x (x + 6) – 7x – 42 = 0

3) x^3 – 5x^2 + x – 5= 0

4) x^4 – 2x^3 + 10x^2 – 20x = 0

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