9^（n+1）-3^3n=72
    470.6=13.8*435x*（780-0.5x）+13.8*(1000-435)*130*(780-0.5*130)
    x2＋6x＝5
    x2＋6x＝5
    y∧3-3y²+3y+1=0
    -3y²+3y+1=0
    -3y²+3y+1=0
    (2*x)^2=19*(0.4-2x)^2*(1-x)
    2*x=19*(0.4-2x)^2*(1-x)
    2*x/(1-x)=19*(0.4-2x)^2
    X0+X1+X2+X3+X4+X5+X6+X7+X8+X9+X10+X11=1 X0+X1+X2<=X3+X4+X5+X6+X7+X8+X9+X10+X11 X0<=X1+X2 X1<=X2 X3<=X4 X3+X4<=X5+X6+X7+X8+X9+X10+X11 X5<=X6+X7+X8+X9+X10+X11 X6<=X7+X8+X9+X10+X11 X7<=X8+X9+X10+X11 X8<=X9+X10+X11 X9<=X10+X11 X10<=X11
    X-7=x÷2
    xarctan1/x=0
    xarctan1/x=1/2
    3^x+4^(3-x)=24
    X/126-(92-X)/1000=0.405
    accos0.167
    accos0.167
    accos0.167
    8x-2=0

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