It is calculated by simple method: 57.6 × 1.6 + 28.8 × 36.8-14.4 × 80.5

57.6×1.6+28.8×36.8-14.4×80=57.6×1.6+28.8×2×18.4-14.4×4×20=57.6×1.6+57.6×18.4-57.6×20=57.6×（1.6+18.4-20）=0

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