a^3－a^2＝－1
    arcsinx
    x（x+10）（x-10）=24000
    x^-3/2
    7600/x+10000/(x+112*0.2)+10000/x＝150
    （7600/（x+112*0.12)+10000/(x+112*0.32)+10000/(x+112*0.12)）＝150
    （7600/（x+112*0.12)+10000/(x+112*0.32)10000/(x+112*0.12)）＝150
    7600/（x+112*0.12)+10000/(x+112*0.32)10000/(x+112*0.12)＝150
    （7600/（x+99*0.12)+10000/(x+99*0.12)+10000/(x+99*0.12)+10000/(x+99*0.12)+10000/(x+99*0.12)+10000/(x+99*0.12)+10000/(x+99*0.12)+10000/(x+99*0.12)+10000/(x+99*0.12)）＝550
    x+x²＝36
    32/x-32/1000=(32/500-32/x)*36/5
    512*（1-x^10）/（1-x）＝1025
    32*（1-x^10）/（1-x）＝1025
    16*（1-x^10）/（1-x）＝1025
    πx+1
    4x+3(2x-3)=12-(x+4)
    (1/4-4/9)x(-6)^2+7/(-1/2)
    3x-4(x+1)=6-2(2x-5)
    (10+x)(5000-100x)=8000
    (1+0.1x)(500-10x)=800

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