2x^2-25x-50=0
    600/(3/4x)=600/x+5
    1/x^3+x
    （-4x+280）×（80-4x)+(4x+120)×(4x+8)=17280
    （40-x）×（80-4x)+(40-x)×(4x+8)=17280
    4x^2-55x+4=0
    ((2/2.22)^(1/0.22))*((0.22)/(2.22))^0.5/((x^(2/1.22)-x^(2.22/1.22))^0.5)=2.55^2
    ((2/2.22)^(1/0.22))*((0.22)/(2.22))^0.5/((x^(2/1.22)-x^(2.22/1.22))^0.5)=2.55^2
    (2/(2.22)^(1/0.22))*((0.22)/(2.22))^0.5/((x^(2/1.22)-x^(2.22/1.22))^0.5)=2.55^2
    x+x/5=120
    x+x/5
    (4+x)*(9+x)=114
    (195+x)*x=-8775
    (195+x)*x=8775
    0.62x-0.09868sin（πx）+0.2418x-0.10075= 0.2122(sin（πx）^3)+0.0374sin（πx）+0.0374sin（π（1.25-2x））
    -2^(2*t+67) = (2*t+6.61) * ln2
    -2^(2*t-33) = (2*t-165.61) * ln2
    -2^(2*t-27) = (2*t-177.61) * ln2
    (67.06+5*x)÷5=（14+x）
    (67.06+5*x)/(14+x)=5

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