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12 April 2019

Ինքնուրույն աշխատանք


Ինքնուրույն աշխատանք
1.   log0,2 (x 1) = -2
x – 1 = 0.2-2
x – 1 = 25
x = 26

2.   log7 (3x 29) = 2
3x – 29 = 72
3x – 29 = 49
3x = 78
x = 26

3.   log0,5 (2x 4) = -2
2x – 4 = 0.5-2
2x – 4 = 4
2x = 8
x = 4

4.   log3 (x2 2x) = 1
x2 – 2x = 3
x2 – 2x – 3 = 0
D = 4 + 12 = 16
x1 = 2 + 4 / 2 = 3
x2 = 4 / 2 = -1

5.   log5 (5 - 3x) = 2
5 – 3x = 52
5 – 3x = 25
-3x = 20
x = -20 / 3

6.   log3 (x + 2) 1
x + 2 3
x 1

7.   log7 (9 - x) > 0
9 – x > 70
9 – x > 1
-x > -8
x < 8

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