Ответ:
1)x∈[1,2]
2)x∈(-∞,-1]∪[4,+∞]
3) x∈(-∞,-1/3)∪(2,+∞)
Объяснение:
1)x²-x-2x+2≤0
x(x-1)-2(x-1)≤0
(x-1)(x-2)≤0
x-1≤0
x-2≥0
x-1≥0
x-2≤0
x≤0
x≥2
x≥1
x≤2
2) x²+x-4x-4≥0
x(x+1)-4(x+1)≥0
(x+1)(x-4)≥0
x+1≥0
x-4≥0
x+1≤0
x-4≤0
x≥-1
x≥4
x≤-1
x≤4
3) 3x²+x-6x-2>0
x(3x+1)-2(3x+1)>0
(3x+1)(x·2)>0
3x+1>0
x-2>0
3x+1<0
x-2<0
x>-1/3
x>2
x<-1/3
x<2
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Answers & Comments
Ответ:
1)x∈[1,2]
2)x∈(-∞,-1]∪[4,+∞]
3) x∈(-∞,-1/3)∪(2,+∞)
Объяснение:
1)x²-x-2x+2≤0
x(x-1)-2(x-1)≤0
(x-1)(x-2)≤0
x-1≤0
x-2≥0
x-1≥0
x-2≤0
x≤0
x≥2
x≥1
x≤2
2) x²+x-4x-4≥0
x(x+1)-4(x+1)≥0
(x+1)(x-4)≥0
x+1≥0
x-4≥0
x+1≤0
x-4≤0
x≥-1
x≥4
x≤-1
x≤4
3) 3x²+x-6x-2>0
x(3x+1)-2(3x+1)>0
(3x+1)(x·2)>0
3x+1>0
x-2>0
3x+1<0
x-2<0
x>-1/3
x>2
x<-1/3
x<2