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tovmassaak0
@tovmassaak0
June 2021
2
18
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решите 2 примера:
4a + 1-4a^2/a,
a+b/a-b - a-b/a+b
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sedinalana
Verified answer
4a + (1-4a^2)/a=(4a
²+1-4a²)/a=1/a
(a+b)/(a-b)-(a-b)/(a+b)=[(a+b)²-(a-b)²]/(a²-b²)=
=(a+b-a+b)(a+b+a-b)/(a²-b²)=2b*2a/(a²-b²)=4ab/(a²-b²)
3 votes
Thanks 1
ПрофиЗнания
4a + 1-4a^2/a = 4a²+1-4a²/a= 1/a
a+b/a-b - a-b/a+b=(a+b)
²-(a-b)²/(a-b)(a+b) = a²+2ab+b²-a²+2ab-b²/a²-b²=
=4ab/a²-b²
2 votes
Thanks 1
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Answers & Comments
Verified answer
4a + (1-4a^2)/a=(4a²+1-4a²)/a=1/a(a+b)/(a-b)-(a-b)/(a+b)=[(a+b)²-(a-b)²]/(a²-b²)=
=(a+b-a+b)(a+b+a-b)/(a²-b²)=2b*2a/(a²-b²)=4ab/(a²-b²)
a+b/a-b - a-b/a+b=(a+b)²-(a-b)²/(a-b)(a+b) = a²+2ab+b²-a²+2ab-b²/a²-b²=
=4ab/a²-b²