arcsin9/11
    arctan9/11
    13.8*200*460
    -63000+11700/1.2+11700/1.2^2+11700/1.2^3+11700/1.2^4+11700/1.2^5+11700/1.2^6+11700/1.2^7+11700/1.2^8+11700/1.1.2^9
    -63000+11700/1.08+11700/1.08^2+11700/1.08^3+11700/1.08^4+11700/1.08^5+11700/1.08^6+11700/1.08^7+11700/1.08^8+11700/1.08^9
    -63000+11700/1.08+11700/1.08^2+11700/1.08^3+11700/1.08^4+11700/1.0^5+11700/1.08^6+11700/1.08^7+11700/1.08^8+11700/1.08^9
    arctan4-arctan0.2
    -63000+117000/1.2+117000/1.2^2+117000/1.2^3+117000/1.2^4+117000/1.2^5+117000/1.2^6+117000/1.2^7+117000/1.2^8+117000/1.2^9
    -63000+117000/1.08+117000/1.08^2+117000/1.08^3+117000/1.08^4+117000/1.08^5+117000/1.08^6+117000/1.08^7+117000/1.08^8+117000/1.08^9
    -150+50/1.1+100/1.1^2+150/1.1^3
    -200+200/1.1+800/1.1^2-800/1.1^3
    （23×3.2＋12.72×2.3+13.83*6.5）/12=
    （18.3×3.2＋18.4×2.3+17.8*6.5）/12=
    3^√23123939.9
    3^√9
    （90+100）/（98+90+200）
    1/2*25000*14.5^2/(65*20*12*1.2*1020)
    3*2.4*10^(-5)*55*4/3*3.14*30^3
    1674.161507/(38*3750)
    4.5*(1-484.8*10^(-5))^(1/2)

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