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∵I4x+3y-5I≥o Ix-2y-4I≥o 有∵I4x+3y-5I+Ix-2y-4I=0 ∴I4x+3y-5I=Ix-2y-4I=0 ∴4x+3y=5 x-2y=4 解方程組得:x=2 y=-1
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