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rrrrtttttt
@rrrrtttttt
October 2021
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решить рациональным способом (13t-9)²-(8t-7)²
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infor5
По формуле разности квадратов a^2-b^2=(a-b)(a+b)
(13t-9)^2 - (8t-7)^2 =(13t-9-8t+7)(13t-9+8t-7)=(5t-2)(21t-16)
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Soulfly1
Раскладываем по формуле разности квадратов:
((13t-9)-(8t-7))((13t-9)+(8t-7))=(13t-9-8t+7)(13t-9+8t-7)=(5t-2)(21t-16)=105t²-80t-42t-32=105t²-122t-32
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rrrrtttttt
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Answers & Comments
(13t-9)^2 - (8t-7)^2 =(13t-9-8t+7)(13t-9+8t-7)=(5t-2)(21t-16)
((13t-9)-(8t-7))((13t-9)+(8t-7))=(13t-9-8t+7)(13t-9+8t-7)=(5t-2)(21t-16)=105t²-80t-42t-32=105t²-122t-32