8.442+52.03x = 93.62+1157x*(1-x)/(1-0.45x)+0.484x+(0.2475x*x)/(1-0.45x)*4.18/32
    1.3x-9.1=1.3
    1/12+1/8
    1/2<-1/x<4 （x<0
    1/2<-1/x<4 x<0
    (（4*x+60)/x)*60=4*x
    x^2-10x-96=0
    1/2<-1/x<4 x<0
    x+ln(1-x)=ln(1.202368)-0.202368
    315*((1+x)^6-1)/(x*(1+x)^6)=800+152*1/x^6
    x^2－38x+305>=0
    -X^3 + X^2 + 8X - 12
    ln(1+x)-x=-0.02374
    1/2<-1/x<4（x>0
    arctan(x/5)+arctan(x/16)+arctan(x/7.17)-arctan(x/101)=90
    1/2<-1/x<4
    1/2x<5-1
    2x+3<6
    6*x^2-7*x-20=0
    4x+5=6x

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