0.125×6.4×8
    9.6×0.25
    1.008÷0.4÷2.5
    82.81÷0.7
    3.4×9.8
    12.87×10.01
    6.5×1.3＋3.5×1.3
    49.43×10.27-49.43×0.27
    1310000*（0.03+3515*0.000008535）
    308.15=1147877.5/3950+298.15ln[10^-4*(10^7/(250000-x*200000)-33200)]
    0.85*40X+0.15*12X=17000*0.53
    0.82*42X+0.18*15X=11183
    0.82*42X+0.18*12X=11183
    0.82*41X+0.18*12X=11183
    20*X+50*X=1200
    8*3
    8x3
    21550*(0.03+24*0.000004748)
    25301956*(0.03+6318*0.000004748)
    1+2^2+3/2-5/2

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