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Lelya31Lenochka31
@Lelya31Lenochka31
July 2022
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Найдите значение выражения: (9x−3)(9x+3)−81x2−7x+9 при x=140.
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sedinalana
Verified answer
(a-b)(a+b)=a²-b²
--------------------------------------
(9x-3)(9x+3)-81x²-7x+9=81x²-9-81x²-7x+9=-7x
x=140 -7*140=-980
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Verified answer
(a-b)(a+b)=a²-b²--------------------------------------
(9x-3)(9x+3)-81x²-7x+9=81x²-9-81x²-7x+9=-7x
x=140 -7*140=-980