Question

Biết: n!=1.2.3...n . Tính: 1.1! + 2.2! + 3.3! + 4.4! + 5.5!

Answer 1

bang 719 tick nha  phạm quang huy va cac bn hay tick cho mk voi nha

Answer 2

 nha bạn

Answer 3

1.1!+2.2!+3.3!+4.4!+5.5!=1x1+2x1x2+3x1x2x3+4x1x2x3x4+5x1x2x3x4x5

=1+4+18+96+600

=719

Answer 4

1.1!+2.2!+3.3!+4.4!+5.5!=719