№1
Разложите на множители:
а)2х²-ху;
б)ab+3ab²;
в)[tex] 2y^{4} +6y^{3} -4y^{2} [/tex];

 №2
Упростите выражения:
а)4a(a-2)-(a-4)²;
б)2(b+1)²-4b;
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