要有方程和算术法噢,

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要有方程和算术法噢,
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要有方程和算术法噢,
要有方程和算术法噢,
 

要有方程和算术法噢,
120 +(X-120)X40%=X÷2
120+0.4X-48=X÷2
72+0.4X=X÷2
X=144+0.8X
0.2X=144
X=720
(120-120X40%)X2÷(40%÷2)
=144÷0.2
=720