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
    1.25×1.1×0.5×435.25×7=
    1.25×1.1×0.5×435.25×8=
    10*0.28*0.332/0.066/0.044/0.2/0.5/19.82/19.82/19.82
    3.0×10^4×4.50×10^9/6300
    3.0×10^4×1.33×10^9/2700
    3.0×10^4×4.50×10^9/6900
    (4*7.97+20.96*4.5+330.28*1.66-61.81*0.61)/6.4
    1544.51/(1000×1450)=
    1.25×1.1×0.5×280.82×7=

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