Выполнить умножение ;
1) (3+a)(2a+1)
2) (5a+a²)(3-2a)
3)(3-x)(2-4a)
4)(-x-3)(2x-4)
1) (3+a)(2a+1)
2) (5a+a²)(3-2a)
3)(3-x)(2-4a)
4)(-x-3)(2x-4)
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Answers & Comments
2.15а-10а^2+3а^2-2а^3=-2а^3-77а^2+15а
3.5-12а-2x+4ax
4.-2x^2+4x-6x+12=-2x^2-2x+12
2) 21а-2а=19а
3) 3-х×2-4а=-6х-4а
4)-х-3×2х-4=-2х-7