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∵3x+4y=12,x≥0,y≥0 ∴x∈[0,4],y∈[0,3] 又∵3x+4y=12,∣2x-3y∣ ∴∣2x-3y∣=∣(17/4)x-9∣ ∴∣2x-3y∣∈[0,9] ∴∣2x-3y∣的最大值為9 ∣2x-3y∣的最小值為0
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