Question

20-18+16-14+12-10+8-6+4-2 tính nhanh

Answer 1

= 2 + 2 + 2 + 2 + 2 = 2 x 5 = 10

Answer 2

= (20 - 18 ) + (16 - 14 ) + ( 12 - 10 ) + ( 8 - 6 ) + ( 4 - 2 )

= 2 + 2 + 2 + 2 + 2 

= 2 x 5 

= 10 

Answer 3

= (20 - 18 ) + (16 - 14 ) + ( 12 - 10 ) + ( 8 - 6 ) + ( 4 - 2 )

= 2 + 2 + 2 + 2 + 2 

= 2 x 5 

= 10 

Answer 4

= 2 + 16

= 18 - 14

= 4 + 12

= 16 - 10

= 6 + 8 

= 14 - 6

= 8 + 4

= 12 - 2 

= 10