(-1/61.31)*((0.5*tan10+tan29.57)/(1-0.5*tan10*tan29.57)-1/tan29.57)*(1/2)
    （1.06）^（-2）
    ((0.5tan10+tan29.57)/(1-0.5tan10tan29.57)-1/tan29.57)/((0.5tan16.7+tan(29.57*1.67))/(1-0.5tan16.7tan(29.57*1.67))-1/tan(29.57*1.67))
    60*(1+e(-1.5)-e(-0.5))
    1+e(-1.5)-e(-0.5)
    0.5((0.5tan10+tan29.57)/(1-0.5tan10tan29.57)+1/tan29.57)35.36
    0.5((0.5tan10+tan29.57)/(1-0.5tan10tan29.57)+1/tan29.57)50
    0.5((0.5tan10+tan29.57)/(1-0.5tan10tan29.57)+1/tan29.57)
    (0.5tan10+tan29.57)/(1-0.5tan10tan29.57)+1/tan29.57
    cos20
    36.9÷0.22=
    (14-64/7)/0.4*2
    (14-64/7)/0.4
    345.6-5
     ln(1/0.444)
    (857-1000)/1000
    50/(（1+0.1）)+100/〖（1+0.1）〗^2 +150/〖（1+0.1）〗^3 -150
    200/（1+0.1） +800/（1+0.1）^2 +(-800)/〖(1+0.1)〗^3 -200
    5700/1.2+12900/1.2^2+16300/1.2^3+27500/1.2^4
    17300/1.2+16200/1.2^2+13800/1.2^3+7600/1.2^4

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