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Жоржетта2002
@Жоржетта2002
August 2022
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помогите!срочно!все примеры надо решить
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Answers & Comments
sedinalana
1
6+10x<21x-12-4
10x-21x<-16-6
-11x<-22
x>2
x∈(2;∞)
2
5-x+2(3-2x)≥0
5-x+6-4x≥0
-5x≥-11
x≤2,2
x∈(-∞;-2,2]
3
(x-4)/(2x-3)≤0
x=4 x=1,5
+ _ +
-------------(1,5)-----------[4]---------------
x∈(1,5;4]
4
(3-6x)/(2x+1)+5>0
(3-6x+10x+5)/(2x+1)>0
(4x+8)/(2x+1)>0
x=-2 x=-0,5
+ _ +
--------------(-2)---------------(-0,5)---------------
x∈(-∞;-2) U (-0,5;∞)
5
2x²-13x+20>0
D=169-160=9
x1=(13-3)/4=2,5 U x=(13+3)/4=4
+ _ +
------------(2,5)-----------(4)----------------
x∈(-∞;2,5) U (4;∞)
6
-x²+3x>0
x(x-3)<0
x=0 x=3
+ _ +
---------(0)---------------(3)----------------
x∈(0;3)
1 votes
Thanks 1
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Answers & Comments
6+10x<21x-12-4
10x-21x<-16-6
-11x<-22
x>2
x∈(2;∞)
2
5-x+2(3-2x)≥0
5-x+6-4x≥0
-5x≥-11
x≤2,2
x∈(-∞;-2,2]
3
(x-4)/(2x-3)≤0
x=4 x=1,5
+ _ +
-------------(1,5)-----------[4]---------------
x∈(1,5;4]
4
(3-6x)/(2x+1)+5>0
(3-6x+10x+5)/(2x+1)>0
(4x+8)/(2x+1)>0
x=-2 x=-0,5
+ _ +
--------------(-2)---------------(-0,5)---------------
x∈(-∞;-2) U (-0,5;∞)
5
2x²-13x+20>0
D=169-160=9
x1=(13-3)/4=2,5 U x=(13+3)/4=4
+ _ +
------------(2,5)-----------(4)----------------
x∈(-∞;2,5) U (4;∞)
6
-x²+3x>0
x(x-3)<0
x=0 x=3
+ _ +
---------(0)---------------(3)----------------
x∈(0;3)