12*3.74*8.15*2
    0.14*（1+0.8）*1.15=
    1.2×［643+202.5+50+250+34.03×（168-163.6）］+1.4×500+0.75×1.4×180
    asin(5/6)
    arccos((35*35+30*30-46*46)/(70*30))
    arccos((35*35+30*30-21*21)/(70*30))
    ((317+(317*0.05))*0.05+(317+(317*0.05)))*0.05+(317+(317*0.05))*0.05+(317+(317*0.05))
    (317+(317*0.05))*0.05+(317+(317*0.05))
    (317+(317*0.05))*0.05+317
    317+(317*0.05)
    arccos((35*35+30*30-46*46)/(70*46))
    arccos(35*35+30*30-46*46)/60*35
    arccos((35*35+21*21-900)/(70*21))
    8+8+8+8+8+8+8+(0.3+0.15)×2
    15*7.5
    169.63*0.98
    147.14*0.98
    2.1*2.4*216+2.4*2.7*88+1.5*1.8*12
    113.39*0.98
    1*2.5*192+1.8*2.5*81+2.5*2.8

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