Day: November 7, 2021
Հանրահաշիվ Նոյեմբերի 1-5
վարժություն 165
զ) ( 10 x -1 ) (x + 21 ) ( 7 x 4 ) ( 7x + 5 ) < 0
( 10 x -1 ) ( x +21 ) ( 7 x 41 ) ( 7, +5 ) =0
[ 10 x – 1 =0
[ x + 2 = 0
[ + x – 4 : 0
[ 7 + 5 =0
[x = 1/ 10
[ x =-2 / 7
[ x = 5 / 7
X∈ ( -2 ; 5 / 7 ) U ( 1/10 ; 4)
Վարժություն 155
ա) x – 5 < 0
x∈ ( – ; 5) ճիշտ է
բ) x -5 > 0 սխալ է
վարժություն 156
ա ) x – (-2 ) < 0 սխալ է
բ ) x -2 < 0 ճիշտ է
7x -1 / 2x +5 > 0 =>
[{ 7x -1 > 0
[{ 2x + 1=0
[{ 7x -1 > 0
[{ 2x -1 =0
[{ 7x > 1
[{ 2x > -5
[{ 7x < 1
[{ 2x < -5
[{ x > 1/7
[{ x > -5 /2
[{ x < 1/7
[{ x < -5/2
( 1) => [ x∊ ( 1 / 2 ; +∞)
[ x∊ ( – ∞ ; – 5 / 2)
(2) => x∊ ( -∞ ; – 5 / 2 ) U (1 / 7 ; + ∞)
վարժություն 171
ա ) 3x > 0 & 3 /x > 0
x >0
x ∊ (0 ;+ ∞ )
3 / x > 0 =>
[{ 3 + 0 x >0
[{ 3 < 0 = x > 0 => x ∊ 10 ; + ∞ )
x <0
բ) -5 x 0 & 5 / x < 0
-5x > 0 = > x < 0 => x∊ ( – ∞ ;0)
5 / x < 0=> x <0 համարժեք են
գ) x +1 / x +2 < 0& ( x+1 ) (x +2 ) < 0
< 0= > [{ x +1 >0
[{ x+2 < 0
[{ x +1 < 0
[{ x + 2 > 0 համարժեք են
( x+1 ) ( x+2) < 0 =>
[{ x +1 <0
[{ x+2 > 0
[{ x +1 > 0
[{ x +2 < 0
վարժություն 172
ա ) 5 /x > 0 => x > 0=> x∈ ( 0 ; +∞)
բ ) – 3 /x < 0 => 3/x <0 => x >0 x∈ (0 ; ∞)
գ ) 1 /x < 0 => x-1 < 0 => x <1 => ( ∞ ; 1)
դ ) 1 / 2x +1 > 0 => 2 x + 1 > 0 => 2x > 1
վարժություն 173
ա ) x-1 / x -2 > 0 =>
[{ x -1 >0
[{ x -2 >0
[{ x +1 < 0
[{ x +2 < 0
[{ x > 1
[{ x >2
[{x <1
[{ x < 2
= x ( -2 ; +∞)
x ∈ (- ∞ ; 1)
վարժություն 175
ա ) 2x + 3 / x +4 < 0
[{ 2x + 3 < 0
[{ x + 4 > 0
[{ 2x +3 >0
[{ 2x + 3 < 0
[{ 2x >3
[{ x <4
[{ 2x < 3
[{x > 4
[{ x < -3/2
[{ x < 4
[{x > -3 /2
[{ x > 4
x ∈ (-∞ ; -3/2) => [ x ∈ ( ∞ ; -3 /2
[ x ∈ ( -3 / 2 ; 4)
x ∈ (-∞ ; -3/2) U ( -3 /2 ; 4 )
բ ) 7 + x / 4x -3 < 0 =>
[{ 7+ x < 0
[{ 4 -3 > 0
[{ 7 + x > 0
[{ 4 x -3 < 0
[{ x < -7
[{ 4x > 3
[{ x > x 7
[{ 4x < 3
[{ xc -7
[{ x > 3/ 4
[{ x> 7
[{ x < 3 /4
վարժություն 188
բ) { ( x+4) x ( x -4 ) > 0
{ ( x + 5 ) 2 < 0
{ ( 1 +4) ( -1 -4 ) = 3 x ( -5 ) = – 15 < 0
{ ( -1 + 5 2)= 16 > 0 => -1 – ը լուծում ՝ չէ ։
November 1-5
English
Task 1.
An adverb ( which has –ly ending) is a word that describes verbs whereas an adjective is a word that describes nouns or pronouns. (Մակբայը լրացնում, նկարագրում է բային, իսկ ածականը՝գոյականին կամ դերանունին)
Eg. He drove off angrily / He is an angry boy.
But there are some words ending in –ly are adjectives. Common examples: deadly, friendly, likely, lovely, silly, ugly, unlikely.
- Put in the correct word.
1 Two people were serious injured in the accident, (serious / seriously)
2 The driver of the car had seriously injuries, (serious / seriously)
3 I think you behaved very selfishly. (selfish / selfishly)
4 Tanya is terribly upset about Losing her job. (terrible / terribly)
5 There was a suddenly change in the weather, (sudden / suddenly)
6 Everybody at the carnival was dressed colourfully. (colourful / colourfully)
7 Linda usually wears colorful clothes, (colourful / colourfully)
8 Liz fell and hurt herself really bad(bad / badly)
9 Joe says he didn’t do well at school because he was badly taught, (bad / badly)
10 The children were playing in the garden happily (happy / happily)
Task 2
Listen to a morning briefing to practise and improve your listening skills, do task 1,task 2
True
false
true
True
true
Task 3
Read the story and do True and False.
Task 4
Նարե Խաչատրյանի բլոգ 