8! + 5! = … ______________ . . . ​

8! = 8 × 7 × 6 × 5 × 4 × 3 × 2 × 1

= (56 × 30) × (12 × 2 × 1)

= (1.680 × 24) × 1

= 40.320 × 1

= 40.320

5! = 5 × 4 × 3 × 2 × 1

= 20 × 3 × 2 × 1

= 60 × 2 × 1

= 120 × 1

= 120

8! + 5!

= 40.320 + 120

= 40.440

8!

= 8 × 7 × 6 × 5 × 4 × 3 × 2 × 1

= 56 × 6 × 5 × 4 × 3 × 2 × 1

= 336 × 5 × 4 × 3 × 2 × 1

= 1.680 × 4 × 3 × 2 × 1

= 6.720 × 3 × 2 × 1

= 20.160 × 2 × 1

= 40.320 × 1

= 40.320

5!

= 5 × 4 × 3 × 2 × 1

= 20 × 3 × 2 × 1

= 60 × 2 × 1

= 120 × 1

= 120

8! + 5!

= 40.320 + 120

= 40.440 ✔