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gggsju
@gggsju
August 2022
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Разложите на многочлены на множители
a)4x^2+8x
б)3m-6n+MN-2n^2
в)9a^2-16
г)y^3+18y^2+81y
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Answers & Comments
Miffka18
А) 4x^2+8x=4x(x+2)
б) 3m-6n+mn-2n^2=(3m+mn)-(6n+2n^2)=m(3+n)-2n(3+n)=(3+n)(m-2n)
в) 9a^2-16=(3a-4)(3a+4)
г) y^3+18y^2+81y=y(y^2+18y+81)=y(y+9)(y+9)
D=18^2-4*81*1=324-324=0
x=-18+0/2=-9
Вот и все)
0 votes
Thanks 1
selmash21
4х^2+8х=4х(х+2)
3m-6n+mn-2n^2=(3m-6n)+(mn-2n^2)=
=3(m-2n)+n(m-2n)=(m-2n)(3+n)
9a^2-16=(3a-4)(3a+4)
(y^3+9y^2)+(81y+9y^2)=y^2(y+9)+9y(9+y)=
=(y+9)(y^2+9y)=y(y+9)(y+9)=y(y+9)^2
0 votes
Thanks 1
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Answers & Comments
б) 3m-6n+mn-2n^2=(3m+mn)-(6n+2n^2)=m(3+n)-2n(3+n)=(3+n)(m-2n)
в) 9a^2-16=(3a-4)(3a+4)
г) y^3+18y^2+81y=y(y^2+18y+81)=y(y+9)(y+9)
D=18^2-4*81*1=324-324=0
x=-18+0/2=-9
Вот и все)
3m-6n+mn-2n^2=(3m-6n)+(mn-2n^2)=
=3(m-2n)+n(m-2n)=(m-2n)(3+n)
9a^2-16=(3a-4)(3a+4)
(y^3+9y^2)+(81y+9y^2)=y^2(y+9)+9y(9+y)=
=(y+9)(y^2+9y)=y(y+9)(y+9)=y(y+9)^2