Mathematics
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    4/49-24/144
    4/48-23/144
    4/48
    1-4/48
    (-1)-4/48
    (-1)+(-4)/48
    3/45-1/3
    3^(-2)
    3^(-2)*tan45
    3^(-2)*tan30
    (x^2-9)^2
    (x^2+1)^2-(x-3)^2
    tan3
    5.7366*e(-5)
    10 2/1
    102/1
    (x-20)×0.8
    2-3
    20000(x+1)10(1+2x)=60000
    x[1200-30(x-30)]=36750

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