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Алина20123
@Алина20123
July 2022
1
6
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Разложите множители. Не могу понять.. Заранее спасибо
[tex]1) 16-24y+9y^{2} =
2) 9(a-b)-c^{2} =
3) 3x^{2}-30x+75=
4) 15xy^{2} +5xy-20 x^{2} y=
5) 3a^{2} -3b^{2} -a+b=[/tex]
[tex]1) 16-24y+9y^{2} =[/tex]
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(a-b)²=a²-2ab+b²
a²-b²=(a-b)(a+b)
16-24y+9y²=4²-2*4*3y+3²y²=(4-3y)²=(4-3y)(4-3y)
3x²-30x+75=3(x²-10x+25)=3(x²-2*x*5+5²)=3(x-5)²=3(x-5)(x-5)
15xy²+5xy-20x²y=5xy(3y+1-4x)
3a²-3b²-a+b=3(a²-b²)-(a-b)=3(a-b)(a+b)-(a-b)=(a-b)(3(a+b)-1)=(a-b)(3a+3b-1)
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Answers & Comments
a²-b²=(a-b)(a+b)
16-24y+9y²=4²-2*4*3y+3²y²=(4-3y)²=(4-3y)(4-3y)
3x²-30x+75=3(x²-10x+25)=3(x²-2*x*5+5²)=3(x-5)²=3(x-5)(x-5)
15xy²+5xy-20x²y=5xy(3y+1-4x)
3a²-3b²-a+b=3(a²-b²)-(a-b)=3(a-b)(a+b)-(a-b)=(a-b)(3(a+b)-1)=(a-b)(3a+3b-1)