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xStormx
@xStormx
January 2021
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Bonjour qui peut m’aider s’il vous plaît ? Merci
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swnn
1. -4x+7 ≥ -2x+5
-4x+2x ≥ 5-7
-2x ≥ -2
x ≤ -2/-2
x ≤ 1
S=]-infini;1]
2. (3x-8)(5-2x) < 0
3x-8<0 ou 5-2x<0
3x<8 ou -2x<-5
x<8/3 ou x>-5/-2
x>2,5
3. (x+5)(-3x+7)+(x+5)(x-2) > 0
(x+5)[(-3x+7)+(x-2)] > 0
(x+5)(-3x+7+x-2) >0
(x+5)(-2x+5) > 0
x+5>0 ou -2x+5>0
x>-5 ou -2x>-5
x<-5/-2
x<2,5
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xStormx
Merci
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Lista de comentários
-4x+2x ≥ 5-7
-2x ≥ -2
x ≤ -2/-2
x ≤ 1
S=]-infini;1]
2. (3x-8)(5-2x) < 0
3x-8<0 ou 5-2x<0
3x<8 ou -2x<-5
x<8/3 ou x>-5/-2
x>2,5
3. (x+5)(-3x+7)+(x+5)(x-2) > 0
(x+5)[(-3x+7)+(x-2)] > 0
(x+5)(-3x+7+x-2) >0
(x+5)(-2x+5) > 0
x+5>0 ou -2x+5>0
x>-5 ou -2x>-5
x<-5/-2
x<2,5