0<m≤2 2/3m³+m²-1/3≤00<m≤22/3m³+m²-1/3≤0
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![0<m≤2 2/3m³+m²-1/3≤00<m≤22/3m³+m²-1/3≤0](/uploads/image/z/14344444-28-4.jpg?t=0%EF%BC%9Cm%E2%89%A42+2%2F3m%26%23179%3B%2Bm%26%23178%3B-1%2F3%E2%89%A400%EF%BC%9Cm%E2%89%A422%2F3m%26%23179%3B%2Bm%26%23178%3B-1%2F3%E2%89%A40)
0<m≤2 2/3m³+m²-1/3≤00<m≤22/3m³+m²-1/3≤0
0<m≤2 2/3m³+m²-1/3≤0
0<m≤2
2/3m³+m²-1/3≤0
0<m≤2 2/3m³+m²-1/3≤00<m≤22/3m³+m²-1/3≤0
2/3m³+m²-1/3≤0
2m³+3m²-1≤0
2m³+2m²+m²-1≤0
2m²(m+1)+(m+1)(m-1)≤0
(m+1)(2m²+m-1)≤0
(m+1)²(2m-1)≤0
2m-1≤0 m≤1/2 ∵0<m≤2 联立得
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