If "!" Is a mathematical operation symbol, and 1! =1，2！ =2×1，3！ =3×2×1，4！ =4×3×2×1… . find the value of 100! 98

If "!" Is a mathematical operation symbol, and 1! =1，2！ =2×1，3！ =3×2×1，4！ =4×3×2×1… . find the value of 100! 98

∵1！ =1，2！ =2×1，3！ =3×2×1，4！ =4×3×2×1… ，∴100!98!=100×99×98×97×… ×198×97×96×… ×1=9900．

If "!" Is a kind of mathematical operation symbol, and 1! = 1, 2! = 2 × 1, 3! = 3 × 2 × 1, 4! = 4 × 3 × 2 × 1 , then the value of 2010! 2009! Is______ ．

∵100！ =100×99×98×… ×1，98！ =98×97×… So 2010! 2009! = 2010 × 2009 ×12009×2008… So the answer is 2010

1 2 3 4 5 6 = 1 (add the operation symbol to make the equation hold) 1 2 3 4 5 6
1 2 3 4 56 = 1 (add the operation symbol to make the equation hold) 1 2 3 4 56 = 3

1×2×3-4+5-6=1
Or 1 + 2 + 3-4 + 5-6 = 1
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