Помогите ребята
Разложите на множители
1) x^2-xy+4y-4x
2) 81-4x^2
3) 25x^2-10xy+y^2
Разложите на множители
1) x^2-xy+4y-4x
2) 81-4x^2
3) 25x^2-10xy+y^2
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Verified answer
1) = х(х-у)-4(х-у) = (х-у)(х-4)2) = (9-2х)(9+2х)
3) = (5х-у)²