2*(（0.5-0.124-0.084）*√（0.5-0.047）^2-（0.5-0.124-0.084）^2+π*（0.5-0.047）^2/180*arcsin(（0.5-0.124-0.084）/（0.5-0.047）)
    2*(0.33*√0.477^2-0.33^2+π*0.477^2/180*arcsin(0.33/0.477))
    2*(0.302*√0.425^2-0.302^2+π*0.425^2/180*arcsin(0.302/0.425))
    2*(0.305*√0.425^2-0.305^2+π*0.425^2/180*arcsin(0.305/0.425))
    2*(0.3*√0.425^2-0.3^2+π*0.425^2/180*arcsin(0.3/0.425))
    2*（0.3*√0.425∧2-0.3∧2＋π*0.425∧2/180*arcsin（0.3/0.425））
    arcsin(0.3/0.425）
    ln1.25
    log(2,10000000)
    1+1
    0.5/0.33=
    200÷((500+300)÷2)
    200/［（500+300）/2］÷2/［（5+7）/2］=
    200÷［（500+300）÷2］÷2÷［（5+7）÷2］=
    lg1.4
    lg0.6
    arctan(-8)
    sin1
    lg26.02
    75+288

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