0＜m≤2 2/3m³+m²-1/3≤00＜m≤22/3m³+m²-1/3≤0

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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