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Машуня2013
@Машуня2013
March 2022
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привидите дроби к общему знаменателю: а) x/x-5 и 3/5-x; б) x/(x-4)^2 и 7/x^2-16; в) 5/x+1 и 7/x-2
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Lyavs
A)x/x-5
3/5-x=3/-(x-5)=-3/(x-5)
б)
x/(x-4)^2=x/(x-4)(x-4)=(x^2+4x)/(x-4)^2(x+4)
7/x^2-16=7/(x-4)(x+4)=(7x-28)/(x-4)^2(x+4)
в)
5/x+1=(5x-10)/(x+1)(x-2)
7/x-2=(7x+7)/
(x+1)(x-2)
5 votes
Thanks 6
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Answers & Comments
3/5-x=3/-(x-5)=-3/(x-5)
б)
x/(x-4)^2=x/(x-4)(x-4)=(x^2+4x)/(x-4)^2(x+4)
7/x^2-16=7/(x-4)(x+4)=(7x-28)/(x-4)^2(x+4)
в)
5/x+1=(5x-10)/(x+1)(x-2)
7/x-2=(7x+7)/(x+1)(x-2)