2x+12.5%(2/3+0.5)

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2x+12.5%(2/3+0.5)2x+12.5%(2/3+0.5)2x+12.5%(2/3+0.5)7/24把12.5%看成1/8,就是1/4*2/3+1/4*1/2=1/6+1/8=7/24

2x+12.5%(2/3+0.5)
2x+12.5%(2/3+0.5)

2x+12.5%(2/3+0.5)
7/24
把12.5%看成1/8,就是1/4*2/3+1/4*1/2=1/6+1/8=7/24

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