25+25*cos-38.66-20*sin-38.66
    25+25*cos-218.66-20sin-218.66
    tan-218.66
    tan-38.66
    tan-218.66
    25+25*cos-218.66-20*sin-218.66
    3310000/(0.98×31101)
    25+25*cos-218.66-20*sin-218.66
    1.4*580+0.3*1680+1740*4.8-3700-1650
    25+25*cos-38.66-20*sin-38.66
    1.4*500+0.3*1500+1500*4.8-3700-1650
    sin-38.66
    sin-38.66
    cos-38.66
    arctan0.8
    arctan（-0.8）
    arctan（-0.8）
    627945+950846
    117871/6.0%×（1-1/（1+6.0%）^25.33)×(1/(1+6.0%)^8)
    92548/(6.0%-2.75%)×(1-((1+2.75%)^8/(1+6.0%)^8))

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