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милашечка24
@милашечка24
August 2021
1
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Помогите пожалуйста со всеми)
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sedinalana
4(1+x)>x-2
4+4x>x-2
4x-x>-2-4
3x>-6
x>-2
x∈(-2;∞)
(x²-25>0
(x-5)(x+5)>0
x=5 x=-5
+ _ +
-----------------(-5)-----------(5)-------------------
x∈(-∞;-5) U (5;∞)
3x²+7x-6<0
D=49+72=121
x1=(-7-11)/6=-3
x2=(-7+11)/6=2/3
+ _ +
--------------(-3)-------------(2/3)-------------------
x∈(-3;2/3)
-4<8-3x<5
-4-8<-3x<5-8
-12<-3x<-3
-3<3x<12
-3/3<x<12/3
-1<x<4
x∈(-1;4)
2 votes
Thanks 1
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Answers & Comments
4+4x>x-2
4x-x>-2-4
3x>-6
x>-2
x∈(-2;∞)
(x²-25>0
(x-5)(x+5)>0
x=5 x=-5
+ _ +
-----------------(-5)-----------(5)-------------------
x∈(-∞;-5) U (5;∞)
3x²+7x-6<0
D=49+72=121
x1=(-7-11)/6=-3
x2=(-7+11)/6=2/3
+ _ +
--------------(-3)-------------(2/3)-------------------
x∈(-3;2/3)
-4<8-3x<5
-4-8<-3x<5-8
-12<-3x<-3
-3<3x<12
-3/3<x<12/3
-1<x<4
x∈(-1;4)