(8.9*7.79+20.49*4.63+371.48*1.75-54.22*0.6)/4.4
    (8.9*7.79+20.49*4.63+371.48*1.75-54.22*0.6)/5.4
    (8.9*7.79+20.49*4.63+371.48*1.75-54.22*0.6)/6.4
    （540-480）÷（500-480）
    2/11/28.6
    0.8*3.14*10*1/3
    （870-120-10×25）÷25
    1.08^2
    0.8×3.56+0.4×1.78
    0.8+3.4*1.25
    12.35075*0.8
    5+4.9005*1.5*1.0
    5*4.9005*1.5*1.0
    3.537×10.7×3.9+10×3.9
     (9+(21-9)÷(100000-20000)×(50212.3762-20000)×0.8
    (9+（21-9）÷(100000-20000)×(50212.3762-20000))×0.8
    (4.2÷(500000-100000)×(268452.69-100000))×1.7×0.8
    (4.2÷(500000-100000)×(268452.69-100000)×1.2×0.8
    (4.2÷(500000-100000)×(268452.69-100000))×1.2×0.8
    (21+(45-21)÷(500000-100000)×(268452.69-100000)×1.2×0.8

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