8/15*13/27+14/27*11/15
    2+2(1+x)+2(1+x)^2=9.5
    （80-y-65）（100＋10y）＝1560
    1.1^20
    1.678*x^(4/3)-0.678x=1
    （4500×12×0.9-60%×70X×6.95%）÷(40%×70X+5%×70X)=3.8%
    10/ln(10/5)
    5/(ln(x-5/x-10)=3
    5/(ln(x-5/x-10)=9.1
    5/(ln(x-5/x-10)=5
    5/(ln(x-5/x-10)=7.5
    (x-5-x+10)/{(ln(x-5/x-10)}=7.5
    (x-5-x+10)/{(ln(x-5/x-10)}=7.21
    (-2x+220)(x-40)
    40*x = 200(1+0.1)^(X-1)
    -（1/40）*（80*e((60^2-x)/50)+e((180^2-x)/800)）=0
    (0.01711+0.002+0.911*10^-6*17.897+0.01214)^-1
    56.166/(25-9.82+2-0.15)
    56.166*(25-9.82+2-0.15)
    2(25-9.82)*1.85

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