99.85/123.85＝x/396.162
    103.85/123.85＝x/396.162
    111.85/123.85＝x/396.162
    115.85/123.85＝x/396.162
    （1.11+X）/(3.85+X)=0.3
    X-(X/1.09*0.03)=279980485.99
    x-x/1.09*3%=98
    x*x*x+x*x=810
    x*x*x*x＋1469.7237x-839.4155＝0
    x*4＋1469.7237x-839.4155＝0
    x*x+x-7943722218936282=0
    x*x+x-7943722218936282
    V=159.6492+0.8891V
    V=159.642+0.8891V
    49(x-3)²=16（x+6）²
    x（8x+5）=3
    x^3-100x=24000
    （0.00574-x）（0.05574-x）/（0.04426+x）＝6.6*10^（-4）
    x^1/x
    ln(tanx)

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