1.1!+2.2!+3.3!+4.4!+5.5!
=(2-1).1!+(3-1).2!+(4-1).3!+
(5-1).4!+(6-1).5!
=2!-1!+3!-2!+4!-3!+5!-4!+6!-5!
=6!-1!=720-1=719
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1.1!+2.2!+3.3!+4.4!+5.5!
=(2-1).1!+(3-1).2!+(4-1).3!+
(5-1).4!+(6-1).5!
=2!-1!+3!-2!+4!-3!+5!-4!+6!-5!
=6!-1!=720-1=719
biet n! = 1.2.3...n. tinh 1.1! + 2.2! + 3.3! + 4.4! + 5.5! =
biet n!=1.2.3...n .tinh 1.1!+2.2!+3.3!+4.4!+5.5!
biet n!=1.2.3.....n: tinh 1.1!+2.2!+3.3!+4.4!+5.5!=............................
hepl me
1.1!+2.2!+3.3!+4.4!+5.5!
tính 1.1!+2.2!+3.3!+4.4!+5.5! = ?
Tính: 1.1! + 2.2! + 3.3! + 4.4! + 5.5! = ?
S= 1.1! + 2.2! + 3.3! + 4.4! + 5.5!
Tính: 1.1! + 2.2! + 3.3! + 4.4! + 5.5! =
Biết: . Tính: 1.1! + 2.2! + 3.3! + 4.4! + 5.5! =