√3
    2√2
    2-(-3)
    (-3)-2
    (-3)-(-2)
    320*50-240*60
    790*1.8/1.3*1.16
    790*1.7/1.3*1.16
    740*1.6/1.3*1.55*1.12
    779/1.3*1.44*2.15
    96+64+48
    1/e
    (1/e)^(1/e)^(1/e)
    (1/e)^(1/e)
    log(2,64)
    log(2,1000000000)
    log(2,40000)
    log40000
    A(33)
    807.2/(0.85×0.85)×0.8

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