-0.267×52.2×3.3-0.133×42×3.3
    1/3（52.2+42）3.3-84.4+1/3（-121.2+84.4）
    1/3(52.2+42)3.3-84.4+2/3(-121.2+84.4)
    1/3×52.17×3.3-64.40
    1/3(52.17+42)×3.3-64.40×2/3=
    1/3(52.17+42)×3.3-64.40/3
    -0.267×52.17×3.3-0.133×42×3.3
    1.0×52.17+1.222×42
    -1.267×52.17-1.311×42
    0.733×52.17+0.866×42
    4-4* -1*35
    0.067×52.17×3.3+0.200×42×3.3
    -0.267×52.17×3.3-0.311×42×3.3
    0.244×52.17×3.3+0.289×42×3.3
    1/3×68.64×3.3-78.91
    1/3(68.64+42)×3.3-78.91×2/3
    1/3(68.64+42)×3.3-78.91/3
    -0.267×68.64×3.3-0.133×42×3.3
    -0.267×68.7×3.3-0.133×42×3.3
    -0.267×68.64×3.3-0.089×42×3.6

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