arctan100x-arctan2x=30
    arctan100x-arctan2x=30
    x^2+2.13x+7.95=0
    3.14/（x（1-0.378^2）^0.5）=1.2
    x/19.5-x/21=1/20
    109.1/2+3.45x/2=168
    54.55+3.48x/2=168
    109.1/4.52x=168
    109.1/4.52x
    150/0.65/250=4/22+1/(22x)+6/(13x)+3/(4x)+6/(5.5x)
    250=0.8*0.4^2/(1.05^2*X^2)*521.5/(0.25*3.14*0.4^2)+0.9*(1-0.4^2/(1.05^2*X^2))*100
    x^3+8x^2+18x+16＝0
    x^3+8x^2+18x+16＝0
    x^3+8x^2+18x+16＝0
    ((1+(1+0.2x^2)/(7x^2-1))^3.5)(1+2.8/2.4(x^2-1))=11.3
    ((1+(1+0.2x^2)/(7x^2-1))^3.5)/(1+0.2x^2)^3.5=11.3
    ((1+7/6x^2)(1+(1+0.2x^2)/(7x^2-1))^3.5)/(1+0.2x^2)^3.5=e^(-199.5/287)
    ((1+7/6x)(1+(1+0.2x)/(7x-1))^3.5)/(1+0.2x)^3.5=e^(-199.5/287)
    ((1+7/6x)(1+(1+0.2x)/(7x-1))^3.5)/(1+0.2x)^3.5
    (2393+x)÷(4126+x)=0.6

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