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
    x^4-4x^3+4x^2-8x+4＝0
    98=6/（1+x）+100/（1+x）
    （100-2X）(80-x) =608
    8.72/2.18=x/2.47
    x²/1-x
    x^-13x-90=0
    e-x乘ex
    30000/(x+66)+10000/x=150
    0.1777142857142855x+0.007238095238095266=0.297

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