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7.2÷(5-2),=7.2÷3,=2.4(噸);水泥:2.4×2=4.8(噸),黃沙:2.4×3=7.2(噸),石子:2.4×5=12(噸),4.8+7.2+12=24(噸),答:配製這種混凝土一共需要用資料24噸.
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