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
    12.3+18.55*2
    22.39*12.3+10.9*22.3-9.8*9.2-17.05*8.05-9.7*8.05-16.7*9.3+9.8*10.8+9.8*9.35
    12.3+18.55*2
    （10.9*3+2.36*6+1.1*3+1.2*3+0.84*3+2*3+1.8*3+2.59*3）*1.15
    10.9*3+2.36*6+1.1*3+1.2*3+0.84*3+2*3+1.8*3+2.59*3
    （5.4*1.4+1.5*1.6+1.95*1.24）*3=
    （1.35+0.85+0.85+1.4+12.9+0.7+8.3+0.6+10.6）*1*0.7
    3.5*0.6+5.6*0.8=
    1.2*0.8*2+1*1.5*2
    1.2*0.8*0.15*2+1*3.5*0.15*2
    （3.9*3.22-0.67*1.56）

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