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FefilovaJulia
@FefilovaJulia
July 2022
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khkhara
Б)0,01x^2-9>0
1/100x^2-9>0
100*1/100x^2-100*9>100*0
x^2-100*9>0
(x-10*3)(x+10*3)>0
(x-30)(x+30)>0
(-∞, -30)U(30,+
∞)
г)3x^2-4x+8>=0
3x^2-4x+8=0
D=16-96=-80
нет корней
е)x^2+20x+100<=0
(x+10)^2<=0
x+10=0
x=-10
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Answers & Comments
1/100x^2-9>0
100*1/100x^2-100*9>100*0
x^2-100*9>0
(x-10*3)(x+10*3)>0
(x-30)(x+30)>0
(-∞, -30)U(30,+∞)
г)3x^2-4x+8>=0
3x^2-4x+8=0
D=16-96=-80
нет корней
е)x^2+20x+100<=0
(x+10)^2<=0
x+10=0
x=-10