（800000/1.06*0.06）*1.12
    1.8/（250-8）*8*0.02644*1/1000=
    78➗5.6=
    758.96*(tanarccos0.76-tanarccos0.94)
    982.62*(tanarccos0.77-tanarccos0.95)
    tanarccos0.77-tanarccos0.95
    arctan0.04
    arctan0.04
    310727/55.92
    166512+144215
    30413/4.8%×（1-1/（1+4.8%）^8.58)×(1/(1+4.8%)^8)
    791275/296.31
    255200+536075
    34910/(4.8%-3.5%)×(1-((1+3.5%)^8/(1+4.8%)^8))
    48192/4.8%×（1-1/（1+4.8%）^32)×(1/(1+4.8%)^8)
    34910/(4.8%-3.5%)×(1-((1+3.5%)^8/(1+4.8%)^8))
    1/98001
    -0.5e+0
    9/8*3^4-1/4*9
    1.00000000000000000000/3

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