(0.7-0.4)×0.5×44.63=
    2.5×2×3.30+2×2×4.76
    2.5×(2×4.41+9.03+2×3.30)
    2.5×(2×4.41+9.03)
    (0.6-0.4)×0.5×8.033
    0.45×2×(3.30+4.76)
    0.45×(2×4.41+9.03+2×3.30)
     0.45×(2×4.41+9.03)
     2.5×2×(3.30+4.76)
     2.5×(2×4.41+9.03+2×3.30)
    2021^(1/2021)
    2021^1/2021
    (2×50.3)/(600×100)
    (2×50.3)/(600×200)
    0.7×1.43×600×665
    0.25×1.0×14.3×600×665
    1/2×（13.125+10）×7
    (700-35)/600
    14^2-15^2
    13^2

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