39130434783/11
    6.3-1.9＋4.7-8.1
    20*(150/640)=
    46+7*15-45=
    2(0.213√(0.34^2-0.213^2)+(π0.34^2)/180 * arcsin(0.213/0.34))
    2*(0.21*√(0.34^2-0.213^2)+π/180*0.34^2*arcsin(0213/0.34))
    cos(3.1415926535/7)
    cos((12*1+1)*3.1415926535/36)*12^(1/12)
    cos((12*1+1)*3.1415926535/36)
    cos((12*0+1)*3.1415926535/36)
    12^(1/12)
    2^3-3×2^2+4
    （3^5×5^6）÷（3^4×5^6）
    3^5×5^6
    (8000000+800000+200000-800000)/40=
    909.200685/4
    10.27*491^2*610*6.02*10^（-7）
    10.27*491^2*610*10^（-30）*6.02*10^23
    1.525082*4
    2.31^2-（3.47/2）^2=

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