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he11sp0re
@he11sp0re
November 2021
1
12
Report
Помогите представить в виде произведения многочлен:
1) a³+a²-a-1;
2) 2х³-2хy²-8х²+8y²;
3) 5а²-5b²-15а³b+15аb³;
4) а²b²-1-b²+a².
Заранее спасибо!!!!
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anmih
Verified answer
1) a³+a²-a-1=а(а²-1)+(а²-1) =
(а²-1)(а+1)
;
2) 2х³-2хy²-8х²+8y² = 2х²(х-4)-2у²(х-4)=(2х²-2у²)(х-4)=
2(х-у)(х+у)(х-4)
;
3) 5а²-5b²-15а³b+15аb³ = 5(a-b)(a+b)-15ab(a²-b²)=
5(a-b)(a+b)(1-3ab)
;
4) а²b²-1-b²+a²= (a
²-(b+1)²) =
(a-b-1)(a+b+1)
.
2 votes
Thanks 1
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Answers & Comments
Verified answer
1) a³+a²-a-1=а(а²-1)+(а²-1) = (а²-1)(а+1);2) 2х³-2хy²-8х²+8y² = 2х²(х-4)-2у²(х-4)=(2х²-2у²)(х-4)=2(х-у)(х+у)(х-4);
3) 5а²-5b²-15а³b+15аb³ = 5(a-b)(a+b)-15ab(a²-b²)=5(a-b)(a+b)(1-3ab);
4) а²b²-1-b²+a²= (a²-(b+1)²) = (a-b-1)(a+b+1).