(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
    361*0.95
    39÷20
    90=5/(1+y)+5/(1+y)2+105/(1+y)3
    sin30*25
    sin25
    (9.81*909.1*0.557^3/97.789/10^-9)^0.25
    (0.016233+0.0003+0.911*10^-6*17.8969+0.009596)^-1
    2520.188*3.76^-0.25
    (50-x)^0.75=0.4315*(x-40)
    2520.188*3.644^-0.25
    (50-x)^0.75=0.415*(x-40)

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