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Панда12377
@Панда12377
July 2022
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Найдите значение выражения (5b-9)^2-10b(5b-9) при b= корень 21
Подробное решение!:) Спасибо:)
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Rechnung
Verified answer
(5b-9)²-10b(5b-9)=(5b-9)(5b-9-10b)=(5b-9)(-5b-9)=-(5b-9)(5b+9)=-(25b²-81)=
=-25b²+81
при b=√21 -25(√21)²+81=-25*21+81= -525+81= -444
4 votes
Thanks 9
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Verified answer
(5b-9)²-10b(5b-9)=(5b-9)(5b-9-10b)=(5b-9)(-5b-9)=-(5b-9)(5b+9)=-(25b²-81)==-25b²+81
при b=√21 -25(√21)²+81=-25*21+81= -525+81= -444