4900x^2+6300-489=0
    （1.4X0.8-1）x=15
    x/120-x/140=4
    lnx+ln(-x)
    X+890/1820X=962800/20
    X+890/1820X=962800
    4-3X=2
    3X+6=4X-5
    cosx=0.5
    1000÷X×3＝3750÷（X+0.2）
    2x^2-51x+280=0
    x+[40-(69-x)]=42
    ((x^3)^-2)=1000
    （x+1）2^x=4^x-x^2-2x-1
    x^5=3^x
    x^9=3^x
    1/(x²+2x)
    x*0.65*2.39=2.8
    x*0.65*2.09=2.8
    x*0.65*2.09=2.28

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