(7-x)/2+x+x+1＝9
    lnx＝0.0125
    x^4×(1+0.01x^2)=100×(1+0.25x^2)
    2x^3+3x^2+x+100=0
    x^3+3*x^2+5*x+5=0
    x^2+6x-1=0
    (18-3x)*(6-2x)=60
    (18-3x)*(6-x)=60
    4^x/（2+4^x）
    x+2x^2*sin(1/x)
    -2*x^2+35*x-300=0
    x*0.9^5*0.99^150*0.999^2115=1000000
    2000000000*0.9^(x/365)*0.99^(x/12)*0.999^x=1000000
    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

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