1987.53*(1-46076944/240.5)
    1987.53*(1-(4*2359*2359)/(15.5*15.5))
    1300-((50+31.6*3+(20.5*3)/2+31.6/2)+(56 +25.1/2+20.5/2))
    1300-((50+31.6*3+(18.4*3)/2+31.6/2)+(56+25.1/2+18.4/2))
    4361-(1300/2-(50+31.6*3+18.4/2+31.6/2))
    1300-((50+31.6*3+18.4/2+31.6/2)+(56+18.4/2+20.5/2))
    5435/(1197*180)
     0.0005*1.39*180*1197
    (0.5*10-3)*1.39*180*11967
    13.8*1620*80.2*(1197-40.1）
    330*(4926+402)
    (4926*(50+1.5*31.6)+402*(50+3.5*31.6+18.4/2))/(4926+402)
    41652÷534
    534×78
    (5851.87-3776.61)(1+0.1)^-1
    (1+0.08)^-1
    (1093.51-x)/x=-0.0327
    sinx＝3/25
    1.44x-x=6000
    90+arctan(4.1*2.45)-arctan(0.25*2.45)-arctan(0.0625*2.45)-arctan(7.07*2.45)

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