Kết quả lun :
\(A=\)\(2002-79+15+79-15\)
\(A=2002+\left(-79\right)+15+79+\left(-15\right)\)
\(A=2002+\left(-79+79\right)+\left(-15+15\right)\)
\(A=2002+0+0\)
\(A=2002\)
Ta có: A= (2002-79+15)- (-79+15)
= 2002-79+15+79-15
= (-79+79)+(15-15)+2002
= 0+0+2002
= 2002
Vậy A= 2002
_Học tốt nha_