Mathematics
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    ln2.52+2×2.52-6
    ln2.51+2×2.51-6
    ln2.55+2×2.55-6
    (5/12+1/19)×12×7/19
    (5/12+1/19)12×7/19
    cos30
    7.5:13
    4.2/2.8
    9÷(2/3)
    9÷2/3
    log(0.5,0.33)
    9÷1
    cos 25
    sin 155
    4-4
    {[(9.5+9+8)/2]+[3(8.5+7)]/10}/[(5-7)2+2]
    (2*6.5*7.5)/(6.5+7.5)
    8lg2
    2lg8
    lg8

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