Question

{189-[34+(20-5)]} : 20

Answer 1

\(=\left(189-\left(34+15\right)\right)\div20=\left(189-49\right)\div20=140\div20=7\)

Answer 2

=(189 - ( 34 + 15 ) ) : 20 = ( 189 - 49 ) : 20 = 140 : 20 =7 

k nha bạn

Answer 3

\(\left\{189-\left[34+\left(20-5\right)\right]\right\}\div20\)

\(=\left\{189-\left[34+15\right]\right\}\div20\)

\(=\left\{189-49\right\}\div20\)

\(=140\div20\)

\(=7\)