[Toán 6]

N

nguyenhanhnt2012

hì

5!=5.4.3.2.1
4!=4.3.2.1
3!=3.2.1
2!=2.1
1!=1

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T

thinhrost1

B
Biết n! = 1 . 2 . 3 . 4 . 5 .....n Tính : 1.1! + 2.2! + 3.3! + 4.4! + 5.5!;););););););););););););):(:(:(:(:(:(:(:(:(:(:(:(











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