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Tanya6164
@Tanya6164
July 2022
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Если (x+y)=x*y=6, то сумма x^3+Y^3=?
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litanalove
(х+у)=ху=6
Система:
х+у=6
ху=6
х=6-у
(6-у) у=6
6у-у²-6=0 (*-1)
у²-6у+6=0
D= 36-24=12
D>0, два корня
у₁= (6-2√3)/2 = 2(3-√3) /2 = 3-√3
у₂= (6+2√3)/2 = 3+√3
х₁= 6-(3-√3 )= 3+√3
х₂ = 6- (3+√3)= 3-√3
Выражение х³+у³ :
(3-√3)³+ (3+√3)³=27-81√3 + 27- (√3)³ + 27+81√3 +27 +(√3)³ =
= 108
0 votes
Thanks 0
zhenyaM2002
Verified answer
(x^3+y^3)=x^3*y^3=6^3=
=216
1 votes
Thanks 1
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Answers & Comments
Система:
х+у=6
ху=6
х=6-у
(6-у) у=6
6у-у²-6=0 (*-1)
у²-6у+6=0
D= 36-24=12
D>0, два корня
у₁= (6-2√3)/2 = 2(3-√3) /2 = 3-√3
у₂= (6+2√3)/2 = 3+√3
х₁= 6-(3-√3 )= 3+√3
х₂ = 6- (3+√3)= 3-√3
Выражение х³+у³ :
(3-√3)³+ (3+√3)³=27-81√3 + 27- (√3)³ + 27+81√3 +27 +(√3)³ =
= 108
Verified answer
(x^3+y^3)=x^3*y^3=6^3==216