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jlianna
@jlianna
August 2022
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(-2х)2*(-2х)3*(-2х)4=
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gelyakovalchuk2003
Так:
(x^2-6x)^2+2(x^2-6x+9)=81
Замена x^2-6x=y
y^2+2(y+9)-81=0
y^2+2y-63=0
y1=7; y2=-9
Обратная замена:
1) x^2-6x=7
x^2-6x-7=0; x=-1; x=7;
2) x^2-6x=9
x^2-6x+9=0; (x-3)^2=0; x=3.
Ответ: х=-1; х=3; х=7.
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jlianna
это 7 класс
Sanyasha
=4x^2×(-8)x^3×16x^4=-512x^9
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jlianna
степень с натуральным показателем и ее свойства
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Answers & Comments
(x^2-6x)^2+2(x^2-6x+9)=81
Замена x^2-6x=y
y^2+2(y+9)-81=0
y^2+2y-63=0
y1=7; y2=-9
Обратная замена:
1) x^2-6x=7
x^2-6x-7=0; x=-1; x=7;
2) x^2-6x=9
x^2-6x+9=0; (x-3)^2=0; x=3.
Ответ: х=-1; х=3; х=7.