3d^2+300d+5000=0
    1/d+1/（d+1）+1/（d+5）=1/（d+2）
    64x^3+32x^2-76x-20=0
    （26.127+x）×0.85＝52.254+67.181-x
    （26.127+x）×0.85＝52.254+68.181-x
    （26.127+x）×0.85＝52.254+69.181-x
    （26.127+x）×0.85＝52.254+70.181-x
    （26.127+x）×0.85＝52.254+71.181-x
    （26.127+x）×0.85＝52.254+72.181-x
    16=sqrt(16x^2+x^4)
    e^(-3.14x/(sqrt(1-x^2)))=0.163
    20x = 32^x
    (12.4-x)/(30.8-x)*40+60=72
    e^(-3.14x/(sqrt(1-x^2)))=0.2
    3a^2-620a-1200=0
    30000÷（a+60）+10000÷a=150
    30000/a+10000/（a+60）=150
    12.03c=（c+3.3）×7.92
    25+x＝32.63+149.131-x
    1000*278*1.11^x=1150*(10x+600)

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