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    (1200+(755*1.7))*25/(0.95/2)*1.4
    (755+1200+(755*0.7)*25/(0.95/2)*1.4
    (755+1200+(755*0.7)*25/(0.95/2)*1.4
    (661+1200)/0.195*4*2*1.4
    5273.6×0.2374
    5273.6*1.06^5*0.06/(1.06^5-1)
    [900×80%×(1+13%)+300]-[(300+370×80%+25×80%+86.45×25%+296.8+82)]
    (13×(tan 35.444-tan 20.562)+22×(tan30.639-tan 20.562))/2π
    arccos(22×cos20.562/(22+2×1×cos14))
    arccos(13×cos20.562/(13+2×1×cos14))
    arccos(13×cos20.562/(13+2×1×cos14))
    0.95×1.1×√((1+0.8)/(0.8-0.7))
    4.1*9.73
    18773*823642856545
    555*6
    (1+5%)^4×5%/[(1+5%)^4-1]
    (1500+37.50)×(1+5%)^4×5%/[(1+5%)^4-1]
    (1500+37.50)×(1+5%)4×5%/[(1+5%)4-1]
    A(3,2)
    7÷(5÷11)×(15÷11)÷(15×7)×5

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