разложить на множители
1)х-3y+x^2-9y^2
2)9m^2+2mn+n^2-25
3)ab^5-b^5-ab^3+b^3
4)1-x^2+10xy-25y^2
решить уравнение
1)3х^2-12x=0
2)49x^2+14x^2+x=0
3)x^3-5x^2-x+5=0
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