Mathematics
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    12.2÷4+7.8÷4
    39÷(1.3×5)-4.84
    0.7×75.7-0.7+0.7×25.3
    3.75÷[0.3×1(1.34-0.84)]
    62.9+18.2÷(2.3-1.6)
    10×5-5
    tan30
    tan30
    tan30
    (-27/8)^(-2/3)+(0.002)^(-1/2)-10((5)^(1/2)-2)^-1+1
    (-27/8)^(-2/3)+(0.002)^(-1/2)-10((5)^(1/2)-2)^-1+1
    tan90
    11.9-8.4*4/3
    11.9-8.4*3/4
    1:2
    1/2e
    e^(ln(1/2)-1)
    ln(1/2)-1
    2-ln2
    e^1/2

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