0.85 × 999 = 0.85 × (1000 - 1) = 0.85 × 1000 - 0.85 = 850 - 0.85 = 849.15
简便计算0.85×999=
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0.85 × 999 = 0.85 × (1000 - 1) = 0.85 × 1000 - 0.85 = 850 - 0.85 = 849.15