17.81=(1-x^10)/(1-x)
    0.01x=9
    x/（x+100）
    x^2 log（x）
    4x^2-2x-1=0
    x²+2x-146=0
    0=0.35Q-(120+0.2Q)-231.75-(0.35Q*0.13-(5+0.015Q)-140)
    0=0.35Q-(120+0.2Q)-231.75
    0=0.35Q-(120+0.2Q)
    0=0.35Q-(120+0.2Q)-(0.35Q*0.13-(5+0.015Q)-140)
    x^3-140*x^2+600*x+192000
    x^3-140*x^2+600*x+19200=0
    （1+r）2=1.75
    x²-26=16x
    x²+26=16x
    （4-x）（200+50x）+[-2×（200-50x）]＝450
    25-a²-a²-a²+（-15+3a+3a+3a）＝1
    25-a²＝-15+3a
    680x=58240-2080x
    A*742=11742

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