x/(x�0�5-8x+15)≥2x/(x�0�5-8x+15)-2≥0[x-2(x�0�5-8x+15)]/(x�0�5-8x+15)≥0（-2x�0�5+17x-15)/(x�0�5-8x+15)≥0（2x�0�5-17x+15)/(x�0�5-8x+15)≤0[(2x-15)(x-1)]/(x-3)(x-5)≤0所以需要满足x≤1或3
通分的[x-2(x-3)(x-5)]/[(x-3)(x-5)]≧0当x＞3且x≠5解得3＜x＜6.x≠5
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