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G1r2
@G1r2
August 2022
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Помогите пожалуйста!
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1)3x^2-6x^3 2)x^2-10x+25 3)3(x-1)+y(x-1) 4)2a^2-4ab+2b^2
Разложить на многочлен: a^2-3ab+3a-9b и найти его числовое значение при a=1 b=--1/3
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m11m
Verified answer
1)
3x² -6x³ = 3x²(1-2x)
2)
x² -10x+25=(x-5)²
3)
3(x-1)+y(x-1)=(x-1)(3+y)
4)
2a² -4ab+2b²=2(a² -2ab+b²)=2(a-b)²
5)
a² - 3ab+3a-9b=(a² -3ab)+(3a-9b)=a(a-3b)+3(a-3b)=(a-3b)(a+3)
(1 - 3*(-¹/₃))(1+3)=(1+1)*4=2*4=8
3 votes
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G1r2
Спасибо большое!
alinka165
1) =3х^2(1-2х)
2)=(х-5)^2
3)=3х-3+ху-у=(3х-3)+(ху-у)=3(х-1)+у(х-1)=(3+у)(х-1)
4)=2(а^2-2аb+b^2)=2(a-b)^2
5)=a(a-3b)+3(a-3b)=(a+3)(a-3b), если а= 1,b=-1/3, то (1+3)(1+1)=4
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Answers & Comments
Verified answer
1)3x² -6x³ = 3x²(1-2x)
2)
x² -10x+25=(x-5)²
3)
3(x-1)+y(x-1)=(x-1)(3+y)
4)
2a² -4ab+2b²=2(a² -2ab+b²)=2(a-b)²
5)
a² - 3ab+3a-9b=(a² -3ab)+(3a-9b)=a(a-3b)+3(a-3b)=(a-3b)(a+3)
(1 - 3*(-¹/₃))(1+3)=(1+1)*4=2*4=8
2)=(х-5)^2
3)=3х-3+ху-у=(3х-3)+(ху-у)=3(х-1)+у(х-1)=(3+у)(х-1)
4)=2(а^2-2аb+b^2)=2(a-b)^2
5)=a(a-3b)+3(a-3b)=(a+3)(a-3b), если а= 1,b=-1/3, то (1+3)(1+1)=4