20/1.1+20/1.1^2+1020/1.1^3
    430/0.235-(12.12+30+15)/14.87-(60/1000*13+11/0.235)
    142.748918-158.495272
    (50/1.15)+(50/1.15^2)+(50/1.15^3)+(50/1.15^4)
    177.297526-158.495272
    (50/1.05)+(50/1.05^2)+(50/1.05^3)+(50/1.05^4)
    (50/1.1)+(50/1.1^2)+(50/1.1^3)+(50/1.1^4)
    49.73704-45.664502
    (20/1.15)+(20/1.15^2)+(20/1.15^3)
    54.464961-49.73704
    (20/1.05)+(20/1.05^2)+(20/1.05^3)
    （20/1.1）+（20/1.1^2）+(20/1.1^3)
    A(3,2)
    54-38
    16*(1/3)
    !(50)
    !(10)
    !(0)
    !(100）
    2×200-25×200÷300

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