（15140+200+x）*2.2%=4x
    （15140+200+x）*3.3%=4x
    2000*50000=x+1000*50000+150*50000
    300x=280+150x+3x
    41.1=33.8/(100-w)
    400x=1500+160x+8x
    4-X=X+4
    X-(X-4)=4-(X-4)
    62500/11326=(x*(1-x^10))/(1-x)
    300x=280+150x+3x
    5-6X=-2X+1
    d*d+4*d-1=0
    A*(A+18)=360
    1/d+1/(2d+1)=1/(d+1)
    1/d+1/(d+2)+1/(d+3)-1/(d+5)=0
    sqrt（x—6.25）+sqrt（x—0.25）=2
    23000=4600*（（（1-（1+i）^-9)/i)
    2 * x * ln ( x + 1 ) + ( x + 1 ) ^ -1 * x ^ 2 + 2 * ln ( x + 1 ) + 2 * ( x + 1 ) ^ -1 * x + ( x + 1 ) ^ -1 - 2 * x
    1/(2x*sqrt(1-2x^2))=10
    X+X*0.06=250000

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