9(1-0.0452)(x-55.3)/(2x+55.3)+0.0452((x-20)/x+4(x-20)/(x+20))=0
    9(1-0.0447)(x-55.3)/(2x+55.3)+0.0447((x-20)/x+4(x-20)/(x+20))=0
    9(1-0.0440)(x-55.3)/(2x+55.3)+0.0440((x-20)/x+4(x-20)/(x+20))=0
    9(1-0.0432)(x-55.3)/(2x+55.3)+0.0432((x-20)/x+4(x-20)/(x+20))=0
    9(1-0.0420)(x-55.3)/(2x+55.3)+0.0420((x-20)/x+4(x-20)/(x+20))=0
    9(1-0.0404)(x-55.3)/(2x+55.3)+0.0404((x-20)/x+4(x-20)/(x+20))=0
    3x=5
    100=6.1/（1+x）+106.1/(1+x)^2
    a×a+a=240
    1800/x-1800/1.5x =20
    0.493/（50/x+6.8）=0.507/（40/x+8.5）
    100+4x=150+3x
    （360-x）/（396-x）=610/1235
    100X＝150（X-50）
    100X＝100（X-50）
    xln(x/0.0265)=0.24
    xln(x/0.0265)=0.24
    xln(x/0.0265)=0.24
    xln(x/0.0265)=0.24
    xln(x/0.0265)=0.24

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