Question

[Nguyễn Huyền Phương]

Tính nhanh :

A = ( 6 - 2/3 +1/2 ) - ( 5 + 5/3 - 3/2 ) - ( 3 - 7/3 + 5/2 )

Answer 1

[fan FA]

 = 6 - (5+3) - (2/3 + 5/3 -7/3) + ( 1/2 + 3/2 -5/2 ) 
= 6 - 8 - 0 - 1/2 
= -2 - 1/2 
= -2/1/2

Answer 2

[Nguyễn Huyền Phương]

A = 6 - 2/3 + 1/2 - 5 - 5/3 + 3/2 - 3 + 7/3 - 5/2 

A = ( 6 - 5 - 3 ) + ( -2/3 - 5/3 + 7/3 ) + ( 1/2 + 3/2 - 5/2 )

A = ( -2 ) +  0  + ( -1/2 )

A = ( -2 ) + ( -1/2 )

A = -5/2