arccos8.2
    log(3)
    log(3)
    2log(122500)
    -2log(2.51)
    -2log(0.00020215)
    log(4)
    log(2)+log(2)
    log(1)+log(1)
    log(2)
    log(1+1)
    arctan0.08
    9999*9999
    （1+100）*100/2
    (0.7+0.5)×0.24×0.18×20+(0.9+0.5)×0.24×0.18×19+(1.2+0.5)×0.24×0.18×2+(1.8+0.5)×0.24×0.18×10+(1.2+0.5)×0.24×0.18×37
    419.82×0.45×0.24
    3.75*18.5*6
    3.75*195.63+3.75*132.59*4
    （19.5+68.8）*2
    85.35*4

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