60*0.2+68.01125*0.8
    60*0.2+70*0.35+80*0.25+90*0.2
    60*0.2+70*0.35+70.025*(0.25+0.2)
    60*0.2+70*0.35+74.5*（0.25+0.2）
    2/3×0.12×0.05×0.8×25×1.3
    0.12×0.05×65.79×19.7
    0.12×0.05×65.79
    18.275×3.60×1
    0.12×0.05×0.8×0.8×25×1.3
    0.12×0.05×0.8×1.0×25×1.3
    0.12×0.05×19.7×1.0×25×1.3
    0.12×0.05×19.7×0.4×25×1.3
    0.12×0.05×19.7×0.8×25×1.3
    0.779×(1.1×1.4×20+1.1×1.35×18.275×17.6)
    0.779×（1.1×1.4×20+1.1×1.35×19.4×3.60）
    1.1×1.35×171
    1.1×1.35×25
    10×(17.6-0.5)
    1.1×(1.35 ×(69.84 +20 )+1.4 ×20 )
    19.4×3.60

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