300000/（0.7*x*2*(150-2x)）=160
    1/d+1/(d+3.5)+2(d+3)/(d∧2+6d+13)=0
    1/x=4
    1/d+1/(d+1)+1/(d+10)=0
    x+lnx=10
    244661=x*(1130-x/2)
    3000x(20%+50%+8%) (1+A) (1+9%)=3000
    22d∧2＋480d＋4800=0
    d∧2+4d-1=0
    d∧2+d＋3=0
    d∧2＋d＋3=0
    1/d＋1/(d＋2)+1/(d＋3)=1/(d＋5)
    3d∧2＋14d＋10=0
    3d∧2＋14d＋10=0
    3d∧2＋14d＋10=0
    32.5/(x+100)=24.6
    x+1.5x+1.75x=14
    x=76600+1.33%x
    x=76100+1.33%x
    1.235=（（0.021*x^1.85+1603）^0.5）*x^0.84

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