（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)
    2Y=Y-18
    4x^2(1-x^2)=1/2.51/2.51
     x^2（x^2+1）（0.04x^2+1）=100
     x^2（x^2+1）（0.04x^2+1） = 10
     x^2（x^2+1）（0.04x^2+1） = 0.1
    x^2(1+x^2)(1+0.04x^2)=0.1
    4.865x^4+2.1x^2=3.808

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