求X值 (5X+9Y)*0.82=(5*0.85X+9*0.8Y)(5X+9Y)*0.82=(5*0.85X+9*0.8Y)X+Y=66
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求X值 (5X+9Y)*0.82=(5*0.85X+9*0.8Y)(5X+9Y)*0.82=(5*0.85X+9*0.8Y)X+Y=66
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