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arinuhkas
@arinuhkas
June 2022
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ЕЩЁ РАЗ СРОЧНО
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Денис789
1)4x²-7x-5=0
D=49+80=129
x1=(7-√129)/8
x2=(7+√129)/8
5x²+13x+3=0
D=169-60=109
x3=(-13-√109)/10
x4=(-13+√109)/10
x²-3x+8=0
D=9-32=-23<0 корней нет
x1*x2*x3*x4=(7-√129)/8*(7+√129)/8*(-13-√109)/10*(-13+√109)/10=
(49-129)/64*(169-109)/100=-80*60/(64*100)= -0,75
кажется так.
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Денис789
а, ещё 2)x≠0,5;x≠1
2x²-5x+3=0
D=25-24=1
x1=(5-1)/4=1 не по условию
x2=(5+1)/4=1,5
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Answers & Comments
D=49+80=129
x1=(7-√129)/8
x2=(7+√129)/8
5x²+13x+3=0
D=169-60=109
x3=(-13-√109)/10
x4=(-13+√109)/10
x²-3x+8=0
D=9-32=-23<0 корней нет
x1*x2*x3*x4=(7-√129)/8*(7+√129)/8*(-13-√109)/10*(-13+√109)/10=
(49-129)/64*(169-109)/100=-80*60/(64*100)= -0,75
кажется так.
2x²-5x+3=0
D=25-24=1
x1=(5-1)/4=1 не по условию
x2=(5+1)/4=1,5