87.5=（0.021L^1.85+3364）^0.5*L^0.84
    （25.851+x）×2.55＝51.702+69.853-x
    （25.851+x）×2.35＝51.702+69.853-x
    （25.851+x）×2.15＝51.702+69.853-x
    （25.851+x）×1.95＝51.702+69.853-x
    （25.851+x）×1.75＝51.702+69.853-x
    （25.851+x）×1.55＝51.702+69.853-x
    （25.851+x）1.55＝51.702+69.853-x
    （x^2-1）/（x-1）
    2*（240-x）-222=446
    X-X(1-20%）*20%=10080
    1/xe
    x^2-920x+290000÷2.76=0
    x2-920x+290000÷2.76=0
    2x^2-4x-1=0
    3.14*2x^2*(x^2+1)=x+1
    -3.14*2x^2*(x^2+1)=x+1
    10*sqrt(1+(0.44x)^2)/(x*sqrt(1+(0.11x)^2)*sqrt(1+x))=1
    10/(4.4*sqrt(1+4.4^2))=1/sqrt(x)
    10/(x*sqrt(1+x^2))=sqrt(2)/2

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