Mathematics
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    2.1*2*6.840=
    6.9*2*6.840=
    0.18×12×114400/3.9/3.9
    0.45/(2+0.45)
    (29400+29400+22200+22200)/(2×114400)
    7.2*2*6.840=
    0.12×12×114400/3.9/3.9
    0.26/(2+0.26)
    (29400+29400)/(2×114400)
    -1*(2022-2020)
    2*(2017-2020)
    1.5×3×10^4×250×600^3/12/6900
    1.5×3×10^4×250×400^3/12/2700
    1.5×3×10^4×250×600^3/12/6300
    2√129
    √129
    (1.989*(2*43.073+13.396*1.989+8.54217))/(3*(43.073+13.396*1.989+8.54217))
    (1+5%)^5-1
    1+(5%)^5-1
    (10.5+2)^2-(10.5-2)^2

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