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alenasabr
@alenasabr
November 2021
2
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пожайлустооо 3 уравнения прошу срочно
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Varik
1.
2.
3.
Удачи. :-)
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DOandDO
18. x²-5x-14=0
D=b²-4ac=25-4*1*(-14)=25+56=81=9²
x₁=7
x₂=-2
19. 8x²-12x+4=0
4(2x²-3x+1)=0
2x²-3x+1=0
D=b²-4ac=9-4*2*1=1
x₁=1
x₂=0.5
20. 1-2(5-2x)=-x-3
1-10+4x+x+3=0
5x=6
x=1.2
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Answers & Comments
2.
3.
Удачи. :-)
D=b²-4ac=25-4*1*(-14)=25+56=81=9²
x₁=7
x₂=-2
19. 8x²-12x+4=0
4(2x²-3x+1)=0
2x²-3x+1=0
D=b²-4ac=9-4*2*1=1
x₁=1
x₂=0.5
20. 1-2(5-2x)=-x-3
1-10+4x+x+3=0
5x=6
x=1.2