Question

54-(45-30+54)-30+5

.giúp mk tính từg bước vs ạk

Answer 1

54 - ( 45 - 30 + 54 ) - 30 + 5

= 54 - 45 + 30 - 54 - 30 + 5

= ( 54 - 54 ) - ( 45 - 5 ) + ( 30 - 30 )

= 0 - 40 + 0

= - 40

Answer 2

= 54-45+30-54-30+5

= (54-54) + (30-30) - (45-5)

= -40

Answer 3

\(\text{54-(45-30+54)-30+5}\)

\(=54-45+30-54-30+5\)

\(=9+30-54-30+5\)

\(=39-54-30+5\)

\(=-15-30+5\)

\(=-45+5\)

\(=-40\)