4.29-x=420(x/2.1-1)^2
    （2500×12×0.9-70%×100X×6.35%）÷（30%×100X+5%×100X）=3.8%
    3x^4+x^3-24x^2+x+3=0
    0.21*x^2+x-3.36=0
    x=0.42((4.29-1000x)/2.1-1)^2
    3x^3-x^2-4.3*x=0
    x^2+x+5=25
    1=-2.4*10^(-11)*x^3+5.6*10^(-7)*x^2-0.0042*x+14
    1770.391+300.14x+(x-3)(x-3)(273.84+10.12x)/6=(x-3)(x-3)(561.384+33.627x)/6
    x+26/x=13
    X*600/[(1-X)*1800]=0.083
    82/sina=118/sin(180/11-a)
    0.2369268851*（0.344094+0.914277）+0.4786286705*（0.393938+0.684214）+0.5*0.5688888889
    x*3%67000=1
    （x+1)^(2)-9x^(2)=0
    17x=1139
    1/（0.5384693101+2）
    17x=1138
    1/（-0.5384693101+2）
    1/（-0.9061798459+2）

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