(1/3(5.3+1.35) ×41.25+1/2(5.3+1.35) ×48.27-1/3×1.35×421.02)/( 5.3+1.35)
    （20×5.7+19.1×5.3）×2.72+2×5.8×1.65
    （20×5.7）×2.72+2×5.8×1.65
    （20×5.7）×2.30+2×41.7×1.52
    2×41.7×1.52
    （20+18.5×0.5+20×10.5+19.1×5.3）×0.37-2×41.7×0.61
    (20+18.5×0.5+20×10.5）×0.37-2×41.7×0.61
    （20+18.5×0.5+20×10.5）×0.43-2×41.7×0.66
    （20+18.5×0.5+20×4.8）×0.43-2×41.7×0.66
    （19.1×2.2+21×2.5）×2.66+2×30.0×1.63
    （19.1×2.2）×2.66+2×30.0×1.63
    （19.1×2.2）×2.72+2×19.1×1.65
    2×19.1×1.65
    （20+18.5×0.5+20×4.1+19.1×2.9+21×2.5）×0.38-2×30×0.6
    （20+18.5×0.5+20×4.1+19.1×2.9）×0.38-2×30×0.61
    （20+18.5×0.5+20×4.1+19.1×2.9）×0.37-2×5.8×0.61
    （20+18.5×0.5+20×4.1+19.1×0.7）×0.37-2×5.8×0.61
    （20+18.5×0.5+20×4.1）×0.37-2×5.8×0.61
    （20+18.5×0.5+20×4.1）×0.43-2×41.7×0.66
    （20+18.5×0.5）×0.43-2×41.7×0.66

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