3 4

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3 4
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3 4
3 4
 

3 4
3.5+x≥-2x+2 解得x≥-1

3,4, 3,4, 3,4, 3 4 3,4, 3 4 3,4, 3,4, 3,4 3,4, 3,4, 3,4, 3,4, 3,4, 3/4 3,4, 3,4, 3,4,