Решите неравенства
3x-12≤0
5(3+x)-2x≤8
2x-2(6+2x)>2x+7
x(1+5x)-5x(x+14)≤2(x-7)
3x-12≤0
5(3+x)-2x≤8
2x-2(6+2x)>2x+7
x(1+5x)-5x(x+14)≤2(x-7)
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Answers & Comments
3x≤12
x≤12/3
x≤4
2) 5(3+x)-2x≤8
15+5x-2x≤8
3x≤ -7
x≤ -7/3
x≤ -2 1/3
3) 2x-2(6+2x)>2x+7
2x-12-4x-2x>7
-4x>19
x< -19/4
x< -4 3/4
x< -4,75
4) x(1+5x)-5x(x+14)≤2(x-7)
x+5x²-5x²-70x≤2x-14
-71x≤-14
71x≥14
x≥14/71