1400000000*0.9^(x/365)*0.99^(x/12)*0.999^x=1000000
    x^2-21x=0
    x^2-21x+900=0
    2^x^-1
    9x^2-3x-2
    xln（x-1）-2x
    x+25%x=370000
    2xx-5x+3=0
    3x（x-2）=x-2
    3x-50=850 4y=800
    3x-50=425 4y=425
    19492.33={x-468000}*12%
    2x^3-x^2=1
    h
    -x^2-10x+200
    Y=300+0.6×（Y-1000）+1000+1300
    (1+R)∧12-1＝10%
    -x^2-10*x+200
    (4/5）-(120/x)
    -X^2-10xX+200

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