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marabelitsckay
@marabelitsckay
July 2022
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Report
СРОЧНО ПОЖАЛУЙСТА!!)))ОЧЕНЬ НАДО
Докажите тождества:
1. ( 1,5x - 2y )² + ( 2x + 1,5y )² = 6,25 ( x² + y² )
2. ( 3a - 2b )³ + ( 3a + 2b )³ = 18a ( 3a² + 4b² )
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sangers
1.
(1,5x-2y)²+(2x+1,5y)²=2,25x²-6xy+4y²+4x²+6xy+2,25y²=
=6,25x²+6,25y²≡6,25*(x²+y²).
2.
(3a-2b)³+(3a+2b)³=27a³-54a²b+36ab²-8b³+27a³+54a²b+36ab²+8b³=
=54a³+72ab²≡18a*(3a²+4b²).
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Answers & Comments
(1,5x-2y)²+(2x+1,5y)²=2,25x²-6xy+4y²+4x²+6xy+2,25y²=
=6,25x²+6,25y²≡6,25*(x²+y²).
2.
(3a-2b)³+(3a+2b)³=27a³-54a²b+36ab²-8b³+27a³+54a²b+36ab²+8b³=
=54a³+72ab²≡18a*(3a²+4b²).