1/3×(4.6-(-0.651)+(5.6+3.8-4.6)
    1/3×(4.6-(-0.651))(5.6+3.8-4.6)
    5.551*3.8^2+58.641*3.8+53.09=
    169.5+53.09
    5.551*3.8*3.8+58.641*3.8+222.59=
    43.68*3.8
    (14.906*3.8+30.72)/2
    (14.906*3.8+30.72)/2×3.8
    58.641+11.102*3.8
    29.812*3.8+30.72=
    sqrt(45)-sqrt(30)
    (-0.0677×6.42×3.3×3.3)
    (0.0234+0.2×0.0234)×6.42×3.3×3.3+（0.0368+0.2×0.0368）×1.88×3.3×3.3
    (-0.0557×6.42×3.2×3.4)
    (-0.0638×6.42×3.2×3.2)
    (0.0159+0.2×0.0255)×6.42×3.2×3.4+（0.0364+0.2×0.0423）×1.88×3.4×3.2
    (0.0255+0.2×0.0159)×6.42×3.2×3.4+（0.0423+0.2×0.0364）×1.88×3.2×3.4
    64.559/2×[4.6-(-0.651)]
    18.2×1.638
    193.191×[1.89-(5.6-2.8-0.6)]

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