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求X值(5X+9Y)*0.82=(5*0.85X+9*0.8Y)(
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
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
5X*0.82-5*0.85X=9*0.8Y-9Y*0.82
-0.15X=-0.18Y
X=1.2Y
X=1.2*(66-X)
X=36
无解,条件太少
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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