упростите выражения:
а) (2x-5)(3x+4)
б)(x-3у)(2y-5x)
в)a(a-5)-(a-2)(a-3)
г)(2a+1)(4a²-2a+1)
а) (2x-5)(3x+4)
б)(x-3у)(2y-5x)
в)a(a-5)-(a-2)(a-3)
г)(2a+1)(4a²-2a+1)
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Answers & Comments
2) (x-3y)(2y-5x)=2xy-5x^2-6y^2+15xy=17xy-5x^2-6y^2
3) a(a-5)-(a-2)(a-3)=a^2-5a-a^2+3a+2a-6=-6
4) (2a+1)(4a^2-2a+1)=8a^3+1