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shornikt
@shornikt
August 2021
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Даю 50 баллов. 8 и 10 пожалуйста
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армения20171
10)(3b+5)x²-2(b-1)x+2=0
D=(b-1)²-2(3b+5)=0
b²-2b+1-6b-10=0
b²-8b-9=0
D1=16+9=25=5²
b1=4+5=9
b2=4-5=-1
8)x²-mx+4=0
x1=-0,8
по теорема виеета
х1*х2=4
х2=4:(-0,8)=-5
х1+x2=m
m=-0,8+(-5)=-5,8
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Answers & Comments
D=(b-1)²-2(3b+5)=0
b²-2b+1-6b-10=0
b²-8b-9=0
D1=16+9=25=5²
b1=4+5=9
b2=4-5=-1
8)x²-mx+4=0
x1=-0,8
по теорема виеета
х1*х2=4
х2=4:(-0,8)=-5
х1+x2=m
m=-0,8+(-5)=-5,8