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∵ 19961996 = 1996×10000 + 1996 = 1996×(10000+1) = 1996×10001
又:19951995 = 1995×10000 + 1995 = 1995×(10000+1) = 1995×10001
∴ 1995 × 19961996 - 1996 × 19951995 = 1995×1996×10001-1996×1995×10001
又:19951995 = 1995×10000 + 1995 = 1995×(10000+1) = 1995×10001
∴ 1995 × 19961996 - 1996 × 19951995 = 1995×1996×10001-1996×1995×10001
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