0.4*3.14*1.5/3200000
    2*6.64*10^(-2)/(0.332)
    2*6.64*10^(-27)*3.2*10^6/(0.332*3.2*10^(-19))
    9÷4-1÷36
    （2÷3+2）×（2÷3+2）-（-1÷6-3）×（-1÷6+3）
    √12000/100
    √2*2000*3000/100
    15000*15000+15000*15000+3800*3800
    11000*11000+7300*7300+15000*15000
    7-2除以5/4
    log(2/3,1/20)
    log(1/3,1/20)
    arcsin90
    arc sin90
    log(0.9,0.5)
    3.14*0.10875*0.05625
    0.10875*0.05625*(180-2*arccos0.8+2*0.8*sqrt (1-0.8^2))
    3.14*108.75*56.25
    108.75*56.25*(180-2*arccos0.8+2*0.8*sqrt (1-0.8^2))
    （45981-41361）/45981

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