66 - 6 + 7 + 23 - 18 + 2
= 60 + 30 - 20
= 90 - 20
= 70
66 - 6 + 7 + 23 - 18 + 2
= 60 + (7 + 23) - 18 + 2
=60 + 30 - 18 + 2
= 90 - 18 +2
= 72 + 2
= 74
66 - 6 + 7 + 23 - 18 + 2
= 60 + 30 - 20
= 90 - 20
= 70
=(66-6)+(7+23)-(18+2)
=60+30-20
=90-20
=70
đúng thì k mình nha :))
66 - 6 + 7 + 23 - 18 + 2
= ( 66 - 6 ) + ( 7 + 23 ) - ( 18 - 2 )
= 60 + 30 - 16
= 74
66 - 6 + 7 + 23 - 18 + 2
= ( 66 - 6 ) + ( 7 + 23 ) - ( 18 - 2 )
= 60 + 30 - 16
= 74
(66-6)+(7+23)-(18+2)+4
60 + 30 - 20 +4=74
uk đúng