упростите выражения
а)(4x^+3y)(y-2x^2)
б)(5x+2)(x^2-2x-3)
в)(a^2-b^2)(2a+b)-ab(a-b)
г)-3b(1-b^2)(5b+2)
а)(4x^+3y)(y-2x^2)
б)(5x+2)(x^2-2x-3)
в)(a^2-b^2)(2a+b)-ab(a-b)
г)-3b(1-b^2)(5b+2)
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Answers & Comments
б) (5х+2)(х²-2х-3)=5х³-10х²-15х+2х²-4х-6=5х³-8х²-19х-6
в) (а²-b²)(2a+b)-ab(a-b)=2a³+a²b-2ab²-b³-a²b+ab²=2a³-b³-ab²
г) -3b(1-b²)(5b+2)=-3b(5b+2-5b³-2b²)=-15b²-6b+15b⁴+6b³=15b⁴+6b³-15b²-6b