a, 5!=1.2.3.4.5=120
b, 4!-3!=1.2.3.4-1.2.3=24-6=18
ủng hộ nha
\(a,5!=1\cdot2\cdot3\cdot4\cdot5=120\)
\(b,4!-3!=1\cdot2\cdot3\cdot4-1\cdot2\cdot3=24-6=18\)
dễ mà bạn
a) 5! = 1.2.3.4.5 = 120
b) 4! - 3! = 1.2.3.4 - 1.2.3
= 1.2.3.(4-1)
=1.2.3.3
= 18
5!=1.2.3.4.5=120
4!-3!=1.2.3.4-1.2.3=24-6=18