2 câu trả lời
`2. [ 3 - 9 : ( -3 ) + 2. ( 5 - 7 ) ] - 18 : ( -9 ) `
`= 2. [ 3 - ( -3 ) + 2. ( -2 ) ] - ( -2 )`
`= 2. [ 3 + 3 + ( -4 ) ] + 2`
`= 2. [ 6 - 4 ] + 2`
`= 2. 2 + 2`
`= 4 + 2`
`= 6`
$\text{2[3 - 9 : (-3) + 2(5 - 7)] - 18 : (-9)}$
$\text{= 2[3 + 3 + 2(-2)] + 2}$
$\text{= 2[6 + (-4)] + 2}$
$\text{= 2(6 - 4) + 2}$
$\text{= 2 . 2 + 2}$
$\text{= 4 + 2}$
$\text{= 6}$
$\textit{Ha1zzz}$