（38.584+x）×2.35＝38.584+68.968-x
    （38.584+x）×2.2＝38.584+68.968-x
    （38.584+x）×2.05＝38.584+68.968-x
    lnx=6.82
    62=4/3*3.14159265358949*r*r*r
    12*x^5-40*x^3+60*x+15=0
    20000÷b+17600÷(b+30)=10000÷70
    20000÷a+17600÷(a+30)=10000÷70
    20000÷x+17600÷(x+30)=10000÷70
    20000÷X+17600÷(X+30)=10000÷70
    20000/X+17600/(X+30)=10000/70
    20000/X+17600/(X+30)=10000/70
    20000/x+17600/(x+30)=10000/70
    17600/(x+30)+20000/x=10000/70
    （17600/(x+30))+20000/x=10000/70
    （17600/(x+30))+20000/x=10000/70
    17600/(x+30)+20000/x=10000/70
    -（2-x)(x+1)^2
    1500÷x-1800÷1.5x=30
    5*(x^2)+4*√15*x+5=0

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