0.2153+0.0261+0.1767+0.2701+0.1956=
    arctan4.42
    2²
    2sqrt(2)
    5824/8*（85-78）
    8.995×10^3×0.000105^0.5/48.5ln (2.417×48.5)
    (0.012-0.00276) ×（92.9+12.0）/92.9×7.875/7.803/100
    8.995×10^3×0.000081^0.5/3ln (2.417×3)
    1*1=
    (12+0.5-12)*0.15
    0.03*0.0000022/12*0.15
    9.2^1.25
    1/10^12.6
    lg1000
    lg100
    9*ln(1.67)+44
    9*ln(8.89)+44
    (75/8)*(1/0.75)*(1/7.5)
    (100/2)*(1/0.75)*(1/7.5)
    (100/3)*(1/0.75)*(1/7.5)

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