2x*3+11x*2+10x+8＝0
    xcos(x)=1
    sqrt（（9.0/2）^2+（4.85/2）^2）=x
    sqrt（（9.0/2）^2+（43.65/2）^2）=x
    sqrt（（7.4/2）^2+（3.7/2）^2）=x
    sqrt（（7.7/2）^2+（4.85/2）^2）=x
    sqrt（（10/2）^2+（5.3/2）^2）=x
    sqrt（（7.47/2）^2+（4.8/2）^2）=x
    1/2^x+1
    60x➕12＝96x
    600a+(10-a)*400
    （756+x）（x-1）＝1605896
    （756+x）（x+1）＝1605896
    （10841.25+20+X）*3.1%=X*200/360
    （10841.25+20+X）*3.1%=（360/200）*X
    （10841.25+20+X）*3.1%=（360/190）*X
    （10841.25+20+X）*3.1%=（360/210）*X
    （10841.25+20+X）*3.1%=1.8*X
    （10841.25+20+X）*3.1%=1.8*X
    （10,841.25+20+X）*3.1%=1.8*X

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