2/3*1.43*1000×0.4^3×（sin（3.14×0.417））^3+360000×0.001885×0.4×（sin（3.14×0.417+sin（3.14×0.416）/3.14
    2/3*1.43*1000×0.4^3×（sin（3.14×0.417））^3+360000×0.001885×0.4×（sin（3.14×0.417+sin（3.14×0.416）/3.14=
    (10000×1.8)/(0.8×3×10^7×0.0491)
    0.409×15
    (10000×1.355)/(0.8×3×10^7×0.0491)
    0.9×0.753×2
    0.5+(1-0.5)/0.6×1.82/6
    （76+7）（165+7）
    27793.92+64345.17+25317.24+71620.37
    27793.92+53005.13+30408.21+57719.53
    27793.92+64345.17+25317.24+57719.53
    cos(π/7)+cos(2π/7)+cos(3π/7)+cos(4π/7)+cos(5π/7)+cos(6π/7)
    0.67×2.8×10^7×0.049
    1683.775+3302.885
    5973.468-2530.94-896.743-1969.58-1228.32-3302.885
    5973.468-2530.94-896.743-1969.58-1228.32
    789.225+3163.68+5647.875+3567.428+1535.4
    379.642×(1.4+5.8+1.5)
    379.642×(1.4+5.8)
    379.642×1.4

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