（x^2ln（6.6*0.9/8.5/x））/（（1-x）^2*ln（6.6*0.1/9.55/（1-x）））=1
    2-x=1/3x+4/3
    x^2/（1+e-x）
    -arctanx-arctan2x-arctan0.5x=-180
    2arctanx+arctan2x=180
    3.2x=1.6
    （4x^8-4）²
    （4x^8-4）²
    （1-x²）0.8396=x
    25-x=13.55*ln((60-x)/35)
    25-x=13.55*ln((60-x)/35)
    1/100*(8.14+x)＾2/(3.72-x)=1.74
    9/13（x+60）=5/6x-60
    X=14÷X
    4X+5×6.4=3.2
    3/7x+4/15x=28
    （80-x+10）÷3+x÷24×4×6＝100
    0.1854x^2+x^2lnx=0.2877(1-x)^2+(1-x)^2ln(1-x)
    7（X+8）+2X=65
    X-550-(1000*6%/12+1500*8%/12+x*6%/12)=50

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