54000-5.7967x=
    （54000-5.7967x ）=0.38x45.5x
    54000-5.7967x =
    10012003300940275081
    2/4+4/8
    5/25-34/68+66/11
    2/4+6/3
    3x/7−2x/11= 38
    x/5+（x-2）/10=1
    (0.5222 *Z^-1+0.7737*Z^-2-0.8414*Z^-3)(Z+0.2*Z^-1)
    1.4-8/15
    6x-(1/2)＜2
    1234
     407-200/500-407=X-9.0/20.9-X
    -5700+2750/x+2800/x^2+1600/x^3=
    -64*-64=
    3/5*3/5=
    2*2/3=
    (10/13)^2*0.15^2+(3/13)^2*0.04+2*10/13*3/13*3/200
    0.04+0.15^2-2*3/200

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