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又是應用題 2+3+5=10 水泥所占重量比為2/10 砂子所占重量比為3/10 石子所占重量比為5/10 故 水泥的重量為2*(2/10)=0.4噸 砂子的重量為2*(3/10)=0.6噸 石子的重量為2*(/10)=1噸
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