a)5.4 – 18 : 9 b)17. (85 + 15) – 120
= 20 – 2 = 17.100 – 120
= 18 = 170 – 120
= 50
c)23.(17 - 14)
= 23.3
= 8.3
= 24
a) 5 . 2\(^2\) - 18 : 3
⇔ 5 . 4 - 18 : 3
⇔ 20 - 6
⇔ 14
b) 17 . 85 + 15 . 17 - 120
⇔ 17 . ( 85 + 15 ) - 120
⇔ 17 . 100 - 120
⇔ 1700 - 120
⇔ 1580
c) 2\(^3\) . 17 - \(2^3\) . 14
⇔ \(2^3\) . ( 17 - 14 )
\(\Leftrightarrow\) 8 . 3
⇔ 24
a 5 . 22 – 18 : 3
= 5 . 4 -18 : 3
= 20-6
= 14
b 17 . 85 + 15 . 17 -120
= 17. ( 85 + 15 ) -120
= 17 . 100 - 120
= 1700-120
= 1580
c 23 . 17 – 23 . 14
= 8 . 17 - 8 .14
= 8 . ( 17- 14 )
= 8 . 3
= 24