We have,
8×10−(5−1)=76
3×10−(7−2)=25
9×10−(4−3)=89
7×10−(5−4)=69
Then,
8×10−(3−5)=82
Hence, this is the answer.
-13+(-69)+57-(-89)-(53+(-49))
−13+(−69)+57−(−89)−(53+(−49))=____.