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karinakoroleva1000
@karinakoroleva1000
August 2022
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Verified answer
1.
(3х -5у)²=9х² -30ху+25у²
(3х)² - (5у)²=(3х-5у)(3х+5у)
2.
(х+у)(х-у)=х² - у²
(у-4)(у+4)=у² - 16
(2a-b)(2a+b)=4a² - b²
3. Тут, похоже, надо раскладывать(преобразовать), а не по формуле
(х-4у)(х+4у)=х²+4ху-4ху-16у²=
х² -у²
(6а+2)(6а-2)=36а² - 12а+12а - 4=
36а² - 4
=4(9а² -1)=4(3а-1)(3а+1)
(у^6 -3х)(3х+у^6)=
у^12 - 9х²
(3х²+у³)(у³ - 3х²)=
у^6 - 9х^4
1 votes
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karinakoroleva1000
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Answers & Comments
Verified answer
1.(3х -5у)²=9х² -30ху+25у²
(3х)² - (5у)²=(3х-5у)(3х+5у)
2.
(х+у)(х-у)=х² - у²
(у-4)(у+4)=у² - 16
(2a-b)(2a+b)=4a² - b²
3. Тут, похоже, надо раскладывать(преобразовать), а не по формуле
(х-4у)(х+4у)=х²+4ху-4ху-16у²=х² -у²
(6а+2)(6а-2)=36а² - 12а+12а - 4=36а² - 4=4(9а² -1)=4(3а-1)(3а+1)
(у^6 -3х)(3х+у^6)=у^12 - 9х²
(3х²+у³)(у³ - 3х²)=у^6 - 9х^4