12a(3a+1)≤0求解

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12a(3a+1)≤0求解12a(3a+1)≤0求解12a(3a+1)≤0求解12a(3a+1)≤0a(3a+1)≤0a(a+1/3)≤0-1/3≤x≤0

12a(3a+1)≤0求解
12a(3a+1)≤0求解

12a(3a+1)≤0求解
12a(3a+1)≤0
a(3a+1)≤0
a(a+1/3)≤0
-1/3≤x≤0