1
    0.5
    -1600<-40x -40x<-1500
    2a+1>0 2a-3<0
    2x>-3 x-1<8-2x
    135/8 145/8
    75<5y-3(20-y) 5y-3(20-y)<85
    4.7=x/(60+x)
    20>(x/0.9)
    6x+0*1-2(15-x)>60
    60%x+81*40%>90
    60%x=60
    x-(x*0.0053)=5173
    x-880.42=x*0.86%
    （－x）^(2)+2
    （－x）^(2)
    x^3-9x^2+6x+4=0
    2＾2
    2/1（x+1）<3/2x-1
    1-a<0

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