1/21/3
     1800/2.7*2.4=
    1800/2.7*1.4
    1177/2.7*1.4
    arccos0.395
    arccos0.395
    999999^2
    99999^2
    arctan0.95
    arctan0.95
    123456789*987654321
    arctan20
    arctan20
    24×(tan29.841-tan20)+96×(tan19.999936-tan20)
    arccos0.939693
    arccos0.939693
    96×cos20÷96
    514.36/6.5% ×(1-[1/(1+6.5%)^5]
    5.51+0.98+0.78+29.80
    550.68/(1+5%)×4%+550.68/(1+5%)×1.5%×(1+7%+3%+2%）

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