总述：本次共解1题。其中
           ☆算术计算1题

〖1/1算式〗
    作业：求算式 (500×12×(-0.5×12)+500×12×(0.5×12+12)+2×2×(400-12)×12×(0.5×(400-12)+12+12))/(2×500×12+2×2×(400-12)×12) 的值.
    题型：数学计算
    解:
          (500×12×(-0.5×12)+500×12×(0.5×12+12)+2×2×(400-12)×12×(0.5×(400-12)+12+12))/(2×500×12+2×2×(400-12)×12)
        =(500×12×(-6)+500×12×(0.5×12+12)+2×2×(400-12)×12×(0.5×(400-12)+12+12))/(2×500×12+2×2×(400-12)×12)
        =(500×12×(-6)+500×12×18+2×2×(400-12)×12×(0.5×(400-12)+12+12))/(2×500×12+2×2×(400-12)×12)
        =(500×12×(-6)+500×12×18+2×2×388×12×(0.5×(400-12)+12+12))/(2×500×12+2×2×(400-12)×12)
        =(500×12×(-6)+500×12×18+2×2×388×12×(0.5×388+12+12))/(2×500×12+2×2×(400-12)×12)
        =(500×12×(-6)+500×12×18+2×2×388×12×218)/(2×500×12+2×2×(400-12)×12)
        =4132032/(2×500×12+2×2×(400-12)×12)
        =4132032/(2×500×12+2×2×388×12)
        =4132032/30624
        =134.9279
    答案:(500×12×(-0.5×12)+500×12×(0.5×12+12)+2×2×(400-12)×12×(0.5×(400-12)+12+12))/(2×500×12+2×2×(400-12)×12)=134.9279

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