5x+9y=7.5(x+y)
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...
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 展开
(5X+9Y)*0.82=(5*0.85X+9*0.8Y)
X+Y=66 展开
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