2 câu trả lời
`9 xx 9 xx 8 xx 7 xx 6 `
`= 81 xx 8 xx 7 xx 6`
`= 648 xx 7 xx 6`
`=4536 xx 6`
`=27216`
$\text{ 9 x 9 x 8 x 7 x 6 }$
$\text{ = 81 x 8 x 7 x 6 }$
$\text{ = 648 x 7 x 6 }$
$\text{ = 4536 x 6 }$
$\text{ = 27216 }$
`9 xx 9 xx 8 xx 7 xx 6 `
`= 81 xx 8 xx 7 xx 6`
`= 648 xx 7 xx 6`
`=4536 xx 6`
`=27216`
$\text{ 9 x 9 x 8 x 7 x 6 }$
$\text{ = 81 x 8 x 7 x 6 }$
$\text{ = 648 x 7 x 6 }$
$\text{ = 4536 x 6 }$
$\text{ = 27216 }$