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anyazhukova
@anyazhukova
June 2022
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2а³+9-2(а+1)(а²-а+1) при а=0,5
х(х+2)(х-2)-(х-3)(х²+3х+9) при х=1/4
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NoopikxD
1)
2a^3 + 9 - 2(a+1)(a^2-a+1) = 2a^3 + 9 -2(a^3+1) = 2a^3 + 9 -2a^3 -2 = 7
2) x(x+2)(x-2) - (x-3)(x^2+3x+9) = x(x^2-4) - (x^3-3^3) = x^3 - 4x - x^3 +27= 27-4x при x=1/4:
=27-1=26
2 votes
Thanks 5
anyazhukova
3( b-1)²+(b+2)(b²-2b+4)-(b+1)³ при b=-1/3 можете еще этот пожалуйста)
NoopikxD
Все ещё актуально?
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Answers & Comments
2a^3 + 9 - 2(a+1)(a^2-a+1) = 2a^3 + 9 -2(a^3+1) = 2a^3 + 9 -2a^3 -2 = 7
2) x(x+2)(x-2) - (x-3)(x^2+3x+9) = x(x^2-4) - (x^3-3^3) = x^3 - 4x - x^3 +27= 27-4x при x=1/4:
=27-1=26