x^2+1-√（2x^2+1）=-1
    x^2+1-√（2x^2+1）=0
    x^2+1-√（2x^2+1）=1
    x^2+1-√（2x^2+1）=0.5
    x^2+1-√（2x^2+1）=0.25
    x^2+1-√（2x^2+1）=8
    x^2+1-√（2x^2+1）=50
    tanx-0.05x＝0.015
    tanx-0.01745x＝0.0149
    tanx-0.0174x＝0.0149
    tanx-0.05x＝0.015
    440/(500-x)*(x*x-x*x*x/30/(500-x))-10400*(500-x)/27-45680*(460-x)/(500-x)=0
    tanx-0.05x＝0.015
    (166*x-4.63*10^(-4))/(166*x-166*4.66*x*10^(-32))=ln（4.66*x*10^(-32)/x)/(-1.67*10^(-3)*12)
    （62-2x）x＝480
    300/0.2x－300/x=1
    29-112x+48x^2=0
    8x^2-52x+39=0
    (x^3)÷e^(x^2)=1/e
    (arctanx-arctan3)／x-3

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