2^1.5+3×1.5-7
    2^2+3×2-7
    2^1+3×1-7
    2^0+3×0-7
    ln2.5345+2×2.5345-6
    ln2.534+2×2.534-6
    ln2.535+2×2.535-6
    ln2.5405+2×2.5405-6
    ln2.541+2×2.541-6
    ln2.545+2×2.545-6
    ln2.54+2×2.54-6
    ln2.53+2×2.53-6
    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

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