Overview: 4 questions will be solved this time.Among them
           ☆4 arithmetic calculations

[1/4 Formula]
    Work: Calculate the value of equation 1.1+1.3+1.5+1.7+1.9+2.1+2.3+2.5+2.7 .
    Question type: Mathematical calculation
    Solution:
          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
    Answer:1.1+1.3+1.5+1.7+1.9+2.1+2.3+2.5+2.7=17.1
[2/4 Formula]
    Work: Calculate the value of equation (19.99×19.98-20×19.97)÷(20×19.99-20.01×19.98) .
    Question type: Mathematical calculation
    Solution:
          (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
    Answer:(19.99×19.98-20×19.97)÷(20×19.99-20.01×19.98)=1
[3/4 Formula]
    Work: Calculate the value of equation 19÷4+19÷0.4+19÷0.04+19÷0.004+19÷0.0004 .
    Question type: Mathematical calculation
    Solution:
          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
    Answer:19÷4+19÷0.4+19÷0.04+19÷0.004+19÷0.0004=52777.25
[4/4 Formula]
    Work: Calculate the value of equation (20.04×20.05×20.06×20.07+0.00000001)÷(20.05×20.06-0.0001) .
    Question type: Mathematical calculation
    Solution:
          (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
    Answer:(20.04×20.05×20.06×20.07+0.00000001)÷(20.05×20.06-0.0001)=402.2029

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