Bài làm :
Ta có :
\(...=\left(9.28+2.28-5.28\right)\div28=28.\left(9+2-5\right)\div28=9+2-5=6\)
(252+2.28-5.28):28=6
(252+2.28-5.28):28
= ( 252+56-140 ):28
= 168:28
= 6
Chúc bn hok tốt !
\(\left(252+2.28-5.28\right):28\)
\(=\left(252+56-140\right):28\)
\(=168:28\)
\(=6\)