106. Լուծեք անհավասարումը և կոորդինատային ուղղի վրա նշեք լուծումների բազմությունը.
ա) (x – 9)(x – 2) > 0
(x – 9)(x – 2) = 0
x – 9 = 0 | x = 9
x – 2 = 0 | x = 2
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—ο——ο—→
. 2 9 x
բ) (x – 8)(x – 19) < 0
(x – 8)(x – 19) = 0
x – 8 = 0 | x = 8
x – 19 = 0 | x = 19
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—ο——ο—→
. 8 19 x
գ) (x + 3)(x – 5) < 0
(x + 3)(x – 5) = 0
x + 3 = 0 | x = -3
x – 5 = 0 | x = 5
. ///////
—ο——ο—→
. -3 5 x
դ) (x – 4)(x + 7) > 0
(x – 4)(x + 7) = 0
x – 4 = 0 | x = 4
x + 7 = 0 | x = -7
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—ο——ο—→
. -7 4 x
Լուծեք անհավասարումը (107-108)
107.
ա) (2x – 1)(3x + 5) < 0
(2x – 1)(3x + 5) = 0
2x – 1 = 0 | 2x = 1 | x = 1/2
3x + 5 = 0 | 3x = -5 | x = -5/3
բ) (1,2x – 0,75)(7x – 1) < 0
(1,2x – 0,75)(7x – 1) = 0
1,2x – 0,75 = 0 | 1,2x = 0,75 | x = 0,625
7x – 1 = 0 | 7x = 1 | x = 1/7
գ) (4x + 3)(5x + 2) > 0
(4x + 3)(5x + 2) = 0
4x + 3 = 0 | 4x = -3 | x = -3/4
5x + 2 = 0 | 5x = -2 | x = -2/5
դ) (1+1/3 x + 1/12)(0,7x + 4) > 0
(1+1/3 x + 1/12)(0,7x + 4) = 0
1+1/3 x + 1/12 = 0 | 4/3 x = -1/12 | x = -0,0625
0,7x + 4 = 0 | 0,7x = -4 | x = -4/0,7
108.
ա) x² – x > 0
x² – x = 0
x(x – 1) = 0
x – 1 = 0 | x = 1
x = 0
բ) x² + x < 0
x² + x = 0
x(x + 1) = 0
x + 1 = 0 | x = -1
x = 0
գ) 5x² – x < 0
5x² – x = 0
x(5x – 1) = 0
5x – 1 = 0 | 5x = 1 | x = 0,2
x = 0
դ) 3x² + x > 0
3x² + x = 0
x(3x + 1) = 0
3x + 1 = 0 | 3x = -1 | x = -1/3
x = 0
ե) 4x² + 7x > 0
4x² + 7x = 0
x(4x + 7) = 0
4x + 7 = 0 | 4x = -7 | x = -7/4
x = 0
զ) 3x – 2x² < 0
3x – 2x² < 0
x(3 – 2x) = 0
3 – 2x = 0 | 2x = 3 | x = 3/2
x = 0