1+x+xx/3=109
    （1/10x+10）÷（x+10）=2/11
     3x^2+42*x-128 = 0
    3x^2+42*x-128=0
    128+128(1+x)+128(1+x)²
    94 = 100/ (1+r/2)
    89 = 100/ (1+r)
    94.84= 4/ (1+r/2) + 4/ (1+r/2)^2 + (4+100)/ (1+r/2)^3
    97.12= 5/ (1+r/2) + 5/ (1+r/2)^2 + 5/ (1+r/2)^3 + (5+100)/ (1+r/2)^4
    2^2-2(2K-1)=(2K-1)^2
    X*0.9=15880
    X*0.98=2000
    2＝5×(t+0.25)^2-5t^2
    x^2+x+1=0
    x(x+1)=4036
    sqrt(x^2-2)=abs(2/x)
    (x+5)*x=750
    (50245+x*0.09+510+6269)*3.89+x = 227151
    (50245+x*0.09+510+6269)*3.89+x = 57290
    x÷164=0.618

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