ln（1+（x/52）=0.1
    ln（1+x）=0.1
    952=100÷（1+r）+100÷（（1+r）×（1+r））+1100÷（（1+r）×（1+r）×（1+r））
    x+3/x
    1.6(1+x)^2=2.5
    1.6(1+x)(1+x)=2.5
    1.6(1+x)^2=25
    1+n+n*n=43
    a*a-60a+875=0
    cos((7pi)/4)
    （82899-2.5X）*11.4/22.4*0.9=19390+9X
    （82899-2.5X）*11.4/22.4*0.9=19390+10X
    4a+2=0
    x/(x^2+1)
    (a-20)(-2a+80)=150
    1/2x*x-1/2x-45=0
    1.2x*x-1.2x-45=0
    （1.01+1.88x）*55+2490x=223.86
    x(x-1)/2=45
    x/72+0.35x/72+0.35x*1.4/36=50

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