решите уравнения:
1)3х3-12х=0
2)49х3+14х2+х=0
3)х3-5х2-х+5=0

1) \[3x^3-12x=0\] \[3x(x^2-4)=0\] \[3x(x-2)(x+2)=0\] \(x=0\), \(x=2\), \(x=-2\).

2) \[49x^3+14x^2+x=0\] \[x(49x^2+14x+1)=0\] \[x(7x+1)^2=0\] \(x=0\), \(x=-\frac{1}{7}\).

3) \[x^3-5x^2-x+5=0\] \[x^2(x-5)-(x-5)=0\] \[(x^2-1)(x-5)=0\] \[(x-1)(x+1)(x-5)=0\] \(x=-1\), \(x=1\), \(x=5\).

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