abs（2x+3）>1
    5t^3+3t^4=160
    1530X1-510X2=6 5510X2-510X1=-12
    abs（x-5）<8
    【20833x+4583(12-x)+1700*12】*10.5+(21000+5000x)=2000000
    【20833x+4583(12-x)】*10.5+(20000+5000x)=2000000
    3x+2=0
    【20833x+4583(12-x)】*10.5+(21000+5000x)=2000000
    arctan(64/39)-arctan(64/25)-arctan(64/105)+90
    【208+x】=300
    arctan(x/39)-arctan(x/25)-arctan(x/105)=-90
    arctan(x/39)-arctan(x/25)-arctan(x/105)=90
    x*(0.0016x*x+1)^0.5=162.337
    2x-3=3x+2
    arctan(1.88)
    x*(0.0016x*x+1)^0.5=23.81
    abs（2x+1）<3
    abs2x+1<3
    (1+sin28.5)/(1-sin28.5)
    10000=x^2((0.04x)^2 + 1)

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