7.1=(3.1415926/3)^(2/3)*1.38*1.38*x*(6.1)^(1/3)/((1.0564)^2)
    （25.343+x）×0.85＝50.687+66.83-x
    （25.343+x）×0.85＝50.687+67.83-x
    （25.343+x）×0.85＝50.687+68.83-x
    （25.343+x）×0.85＝50.687+69.83-x
    （25.343+x）×0.85＝50.687+70.83-x
    25+x＝31.409+145.651-x
    25+x＝31.409+145.651-x
    1/(2+z)+2/(1+z)+z/(1+2)=4
    1.05^(n-1)-50.4/52.92=50/52.92
    1.05^(n-1)*52.92-50.4=50
    cosx²
    x/2+x^2×sin(1/x)
    x^5+10x^3+20x-25 = 0
    x^5+10x^3+20x-4=0
    x^6-21x^5+175x^4-735x^3+1624x^2-1764x+720=0
    4^x+6^x=9^x
    994.9×((tan(arc0.725)）−(tan(arc0.95)))
    x^3+6x-24=0
    x2/x+1

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