`(1 - 1/2) × (1 - 1/3) × (1 - 1/4) × (1 - 1/5) + 4/5 : 5/3`
`= (2/2 - 1/2) × (3/3 - 1/3) × (4/4 - 1/4) × (5/5 - 1/5) + 4/5 : 5/3`
`= 1/2 × 2/3 × 3/4 × 4/5 + 4/5 : 5/3`
`= (1 × 2 × 3 × 4)/(2 × 3 × 4 × 5) + 4/5 : 5/3`
`= 1/5 + 12/25` `= 17/25`
Cho mình xin hay nhất nha bạn!!!!!
@Drew Mclntyre