Trả lời :
5679 + ( 1357 - 5679 ) - 17
= 5679 + 1357 - 5679 - 17
= ( 5679 - 5679 ) + ( 1357 - 17 )
= 0 + 1340
= 1340
cảm ơn Nguyễn Ngọc Linh nha!
\(5679+\left(1357-5679\right)-17\)
\(=5679+1357-5679-17\)
\(=\left(5679-5679\right)+\left(1357-17\right)\)
\(=0+1340\)
\(=1340\)