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F79062571491
@F79062571491
April 2021
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разложите на множители:
а) 81а^4-1
б) y²-х²-6х-9
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Answers & Comments
Lesben
1)81aˇ4-1=(9aˇ2)-1ˇ2=(9aˇ2+1)(9aˇ2-1)=(9aˇ2+1)(3a+1)(3a-1)
2)yˇ2-xˇ2-6x-9=yˇ2-(xˇ2+6x+9)=yˇ2-(x+3)ˇ2=(y+x+3)(y-x-3)
2 votes
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ahta
A) =(9a²-1)(9a²+1)
б) =y²-(x+3)²=(y-x-3)(y+x+3)
0 votes
Thanks 0
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Answers & Comments
2)yˇ2-xˇ2-6x-9=yˇ2-(xˇ2+6x+9)=yˇ2-(x+3)ˇ2=(y+x+3)(y-x-3)
б) =y²-(x+3)²=(y-x-3)(y+x+3)