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gorizonver
@gorizonver
August 2021
1
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Решить неравенство :
1) 2x(x-3)+16 больше/или равно 3x(5-x)
2) x(2z-5)+4 меньше/или равно x(7-3x)
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Answers & Comments
LissaMir
1)
2x^2 - 6x+16 >= 15x -3x^2
5x^2 - 21x +16>=0
5x^2 - 21x +16=0
D = 441-320=121
x1=3.2
x2=1
(-беск.;1]u[3,2;+беск)
2)
2x^2-5x+4<=7x-3x^2
5x^2-12x+4<=0
5x^2-12x+4=0
D=144-80=64
x1=2
x2=0.4
[0.4;2]
*мастер живописи*
0 votes
Thanks 3
LissaMir
это если во втором все же х, а не z
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Answers & Comments
2x^2 - 6x+16 >= 15x -3x^2
5x^2 - 21x +16>=0
5x^2 - 21x +16=0
D = 441-320=121
x1=3.2
x2=1
(-беск.;1]u[3,2;+беск)
2)
2x^2-5x+4<=7x-3x^2
5x^2-12x+4<=0
5x^2-12x+4=0
D=144-80=64
x1=2
x2=0.4
[0.4;2]
*мастер живописи*