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AnastasiaMilet
@AnastasiaMilet
July 2022
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Прошу, помогите с матешей. Срочно!
а) (7-x)(2+x)
б) (a-1)(a+8)
в) (2-y)(y-3l
г) (a-9)(a+10)
д) (2x+8)(x-1)
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Answers & Comments
Trofimkirillov
А)(7-x)(2+x)=14+7x-2x-x²=14+5x-x²=-x²+5x+14
б)(a-1)(a+8)=a²+8a-a-8=a²+7a-8
в)(2-y)(y-3)=2y-6-y²+3y=5y-6-y²=-y²+5y-6
г)(a-9)(a+10)=a²+10a-9a-90=a²+a-90
д)(2x+8)(x-1)=2x²-2x+8x-8=2x²+6x-8
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Answers & Comments
б)(a-1)(a+8)=a²+8a-a-8=a²+7a-8
в)(2-y)(y-3)=2y-6-y²+3y=5y-6-y²=-y²+5y-6
г)(a-9)(a+10)=a²+10a-9a-90=a²+a-90
д)(2x+8)(x-1)=2x²-2x+8x-8=2x²+6x-8