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MrMalick
@MrMalick
August 2021
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Tanya11062000
1) (4/5-6/5)/(4/5-11/5)=(-2/5)/(-7/5)=10/35=2/7
2) (1.1-0.3)/(0.9+1.1)=0.8/2= 0.4
3) 3x²+19x+28=0
D=361-4*3*28=25
x1=(-19+5)/6=-14/6=-7/3
x2=(-19-5)/6=-24/6=4
4) x²+8x+12=0
D=64-4*12=16
x1=(-8+4)/2=-2
x2=(-8-4)/2=-6
1 votes
Thanks 1
Tanya11062000
остальное по аналогии
andrisd
Verified answer
1. подставим все и извлечем корень( где надо) и получим
(4/5 - 6/5) / (4/5 - 11/5)= (-2/5)/(-7/5) = (2/5) * (5/7) = 2/7
2 votes
Thanks 1
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Answers & Comments
2) (1.1-0.3)/(0.9+1.1)=0.8/2= 0.4
3) 3x²+19x+28=0
D=361-4*3*28=25
x1=(-19+5)/6=-14/6=-7/3
x2=(-19-5)/6=-24/6=4
4) x²+8x+12=0
D=64-4*12=16
x1=(-8+4)/2=-2
x2=(-8-4)/2=-6
Verified answer
1. подставим все и извлечем корень( где надо) и получим(4/5 - 6/5) / (4/5 - 11/5)= (-2/5)/(-7/5) = (2/5) * (5/7) = 2/7