n(n+2)=－0.86
    n(n+2)=0.86
    24010*（1+x）^5=28910
    19670*（1+x）^5=24010
    n(n+2)=27.47
    x-(x-800)*0.2=2000
    x-(x*0.8)*0.2=4000
    x-(x-800)*0.2=2000
    2x^3+11x^2+10x+8=0
    2x^3+11x^2+10x+8=0
    1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*1.821)
    1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*1.821821)
    arcran-0.77
    （0.9876x/265）^2.519+(X/221)^2.011=1
    100a+120(300-a)=33000
    135a+120(300-a)=15300
    30000（x+50）=12000*3*x
    30000（x-50）=12000*3*x
    30000（x-50）=12000*3*x
    x*x=9

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