7.994-5.615
    7.326-5.499
    28000×4+4848.9×6+30440×0.7+1268×4+140.85×4+1745.1×0.64+5×1200+50×200=
    343.5+775+500=
    140.8+28.16
    1842.9/365
    (4+1.1+11+10+1.8+10+2.2+1.8+1.5+10+3.7+22+2.2+65+15+7.5+36+7.5+15+22)×7
    (4+1.1+11+10+1.8+10+2.2+1.8+1.5+10+3.7+22+2.2+65+15+7.5+36+7.5+15+22)×8
    4+1.1×2+11+10*4+1.8+10*4+2.2×2+1.8+1.5+10*4+3.7+22*18+2.2+65*20+15+7.5+36+7.5+15+22*18
    5052*300
    （4+1.1×2+11+10+1.8+10+2.2×2+1.8+1.5+10+3.7+22+2.2+65+15+7.5+36+7.5+15+22）×20
    (4.5×10^3-0.3×1419.5×10^3)/(0.9×0.44×300)
    (4.0-0.08×25) √(14.3/300)
    (4.0-0.08×25) √(14.3/300)
    0.4×1419.5×0.883
    0.5×114.3×1742400
    (1.1×24.59×10^6)/266666.67
    (245.9×0.4)/4
    983.6/4
    √(((8.48+45.75)/1.22)^2+〖38.93〗^2 )

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