atan(1.4)
    2/sqrt(7)
    sqrt(7)
    1.07-〖18.51〗^2/44000
    445/24.04
    0.5×890
    (1.8×10^6)/(0.89×39661×215)
    1.07-〖88.21〗^2/44000
    1250/14.17
    0.542-0.276
    0.542-0.517
    70000÷（1-30%）
    23492÷（1-30％）=
    1/2×1.25×〖48.44〗^2×2.2×2×0.005
    1/2×1.25×〖48.44〗^2×2.05×0.10
    1/2×1.25×〖48.44〗^2×2.05×0.25
    1.35×35.88
    1.00×1.0×1.56×23/1.00
    1.00×(109/10)^0.16×23
    lg3

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