1. 2! + 3! - 2! + 3! = ...
2. 2! - 3! + 2! - 3! = ...
3. 2! + 3! - 2! - 3! = ...
1.
2! + 3! - 2! + 3!
= ( 2 x 1 ) + ( 3 x 2 x 1 ) - ( 2 x 1 ) + ( 3 x 2 x 1 )
= 2 + ( 6 x 1 ) - 2 + ( 6 x 1 )
= 2 + 6 - 2 + 6
= 8 - 2 + 6
= 6 + 6
= 12
--
2.
2! - 3! + 2! - 3!
= ( 2 x 1 ) - ( 3 x 2 x 1 ) + ( 2 x 1 ) - ( 3 x 2 x 1 )
= 2 - ( 6 x 1 ) + 2 - ( 6 x 1 )
= 2 - 6 + 2 - 6
= ( - 4 ) + 2 - 6
= ( - 2 ) - 6
= - 8
--
3.
2! + 3! - 2! - 3!
= ( 2 x 1 ) + ( 3 x 2 x 1 ) - ( 2 x 1 ) - ( 3 x 2 x 1 )
= 2 + ( 6 x 1 ) - 2 - ( 6 x 1 )
= 2 + 6 - 2 - 6
= 8 - 2 - 6
= 6 - 6
= 0
1. 2! + 3! - 2! + 3!
= (2 × 1) + (3 × 2 × 1) - (2 × 1) + (3 × 2 × 1)
= 2 + 6 - 2 + 6
= 12
=============
2. 2! - 3! + 2! - 3!
= (2 × 1) - (3 × 2 × 1) + (2 × 1) - (3 × 2 × 1)
= 2 - 6 + 2 - 6
= -8
=============
3. 2! + 3! - 2! - 3!
= (2 × 1) + (3 × 2 × 1) - (2 × 1) - (3 × 2 × 1)
= 2 + 6 - 2 - 6
= 0
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[answer.2.content]
