总述：本次共解4题。其中
           ☆算术计算4题

〖1/4算式〗
    作业：求算式 1.1+1.3+1.5+1.7+1.9+2.1+2.3+2.5+2.7 的值.
    题型：数学计算
    解:
          1.1+1.3+1.5+1.7+1.9+2.1+2.3+2.5+2.7
        =2.4+1.5+1.7+1.9+2.1+2.3+2.5+2.7
        =3.9+1.7+1.9+2.1+2.3+2.5+2.7
        =5.6+1.9+2.1+2.3+2.5+2.7
        =7.5+2.1+2.3+2.5+2.7
        =9.6+2.3+2.5+2.7
        =11.9+2.5+2.7
        =14.4+2.7
        =17.1
    答案:1.1+1.3+1.5+1.7+1.9+2.1+2.3+2.5+2.7=17.1
〖2/4算式〗
    作业：求算式 (19.99×19.98-20×19.97)÷(20×19.99-20.01×19.98) 的值.
    题型：数学计算
    解:
          (19.99×19.98-20×19.97)÷(20×19.99-20.01×19.98)
        =0.0002÷(20×19.99-20.01×19.98)
        =0.0002÷0.0002
        =1
    答案:(19.99×19.98-20×19.97)÷(20×19.99-20.01×19.98)=1
〖3/4算式〗
    作业：求算式 19÷4+19÷0.4+19÷0.04+19÷0.004+19÷0.0004 的值.
    题型：数学计算
    解:
          19÷4+19÷0.4+19÷0.04+19÷0.004+19÷0.0004
        =4.75+19÷0.4+19÷0.04+19÷0.004+19÷0.0004
        =4.75+47.5+19÷0.04+19÷0.004+19÷0.0004
        =4.75+47.5+475+19÷0.004+19÷0.0004
        =4.75+47.5+475+4750+19÷0.0004
        =4.75+47.5+475+4750+47500
        =52.25+475+4750+47500
        =527.25+4750+47500
        =5277.25+47500
        =52777.25
    答案:19÷4+19÷0.4+19÷0.04+19÷0.004+19÷0.0004=52777.25
〖4/4算式〗
    作业：求算式 (20.04×20.05×20.06×20.07+0.00000001)÷(20.05×20.06-0.0001) 的值.
    题型：数学计算
    解:
          (20.04×20.05×20.06×20.07+0.00000001)÷(20.05×20.06-0.0001)
        =161767.172768÷(20.05×20.06-0.0001)
        =161767.172768÷402.2029
        =402.2029
    答案:(20.04×20.05×20.06×20.07+0.00000001)÷(20.05×20.06-0.0001)=402.2029

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