19.6×0.5098＋20×(1 -0.5098)
    19.3 ×0.4341+19.7×(1 -0.4341)=
    20.8 × 0.9007+ 21.1×(1 - 0.9007)=
    (8.002+64.559)/2×4.6
    166.89×4.391+163.145×1.219-(46.803×3.208+281.267×1.158)
    78.1118×0.1258+92.1384×（1-0.1258）=
    78.1118×0.0550+92.1384×（1-0.0550）=
    78.1118×0.6514+92.1384×（1-0.6514）=
    78.1118 ×0.4306+92.1384×（1-0.4306）=
    (18.86+49.764)/2×(4.6-3.3)
    78.1118×0.5098+92.1384×（1-0.5098）=
    17.1×(4.6-3.3)×1.638+2×12×1.28
    78.1118×0.7199+92.1384×（1-0.7199）=
    (8.002+49.764)/2×4.6=
    (18.86+49.764)/2(4.6-3.3)
    78.1118×0.9573+92.1384×（1-0.9573）=
    17.1×(4.6-3.3)×1.39+2×8×1.179
    =2×8×1.179
    (169.5×6.56+357.091×2.117)-193.191×(5.6+3.81-2.8)-333.42×1.493=
    -2/3=

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