Question

a)7!+5!+8!=?

b)2!+5!+9!=?

Answer 1

7! + 5! + 8! = 1.2.3.4.5.6.7 + 1.2.3.4.5 + 1.2.3.4.5.6.7.8 = 5040 + 120 + 40320 = 45480

2! + 5! + 9! = 1.2 + 1.2.3.4.5 + 1..2.3.4.5.6.7.8.9 = 363002

Answer 2

a)7!+5!+8!=1.2.3.4.5.6.7+1.2.3.4.5+1.2.3.4.5.6.7.8=5040+120+40320=45480

b)2!+5!+9!=1.2+1.2.3.4.5+1.2.3.4.5.6.7.8.9=2+120+362880=363002

Answer 3

Đâu có ,lớp 6 chưa học giai thừa