log(6，12)-log(6，2)
    log(2，8)
    log(√2，8)
    3×4
    180-67.5-67.5
    (4*18.57+20.96*15.1+793.59*10.27+725.88*3.28)/1544.43
    4+20.96+793.59+725.88
    15.26*11.29+58.18*9.64+18.76*6.06+191.72*3.84+168.51*1.2-233.39*0.56-57.74*10.48-160.94*6.48
    15.26*11.29+58.18*9.64+18.76*6.06+191.72*3.84+168.51*1.2-233.39*0.56-57.74*8.6-160.94*1.92
    15.26*7.96+58.18*6.31+18.76*2.73+112.74*1-57.74*7.15-160.94*3.15
    e
    2^48
    ((2^48)-1)/60
    (2^48-1)/60
    2^48/60
    2^48-1
    arctan(0.72133)
    arctan0.72133
    (4*11.71+20.96*8.24+793.59*3.41+31.4*0.22-99.49*10.14-2.75*0.019)/5.64
    21*21

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