a*a+a=42
    a*a+a=25
    (1462.68*X)-(1193.58*X)-378=122656.4841
    (1462.68*X)-(1193.58*X)=123004.3077
    (1462.68*X)-(1193.58*X)=123004.31
    (1462.68*X)-(1193.58*X)=122656.31
    (1462.68*X)-(1193.58*X)=122626.31
    2024x＾2-2023x-2024＝0
    a+105+105a=23.3
    3x^3-13x^2+6x-18＝0
    x^2＝3
    3x＝1
    3a^3-13a^2+6a-18＝0
    7600/(x+112*0.32)+10000/(x+112*0.2)+10000/x=150
    7600/(x+101*0.12)+10000/x+5100/x=150
    7600/(x+101*0.12)+10000/x+7600/x=150
    12.97x=（3.5+x）×7.96
    35.0431=5*0.84*x^15+5x^14+5x^13+5x^12+5*0.72*x^16-1.75（x^10+x^9+x^8+x^7+x^6+x^5+x^4+x^3+x^2+x^1+1)
    0.4x+x=45.8
    4*(6+x)=28

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