877
1)80, 30, 820, 40, 1860, 6390
2)600, 900, 1300, 2000
3)5000, 2783431000, 85000
4)6010000, 15620000, 40000
5)78, 124, 16, 422, 4
6)657,2; 0,5; 57,4; 100
7)0,08; 8,57; 13,04; 1,95
8)8,327; 49,056; 748,1
878
1)90,09-(87,44-(12,85+3,9)+0,981)=90,09-(87,44--16,75+0,981)=90,09-69,709=20,381=20
2)5,53+(9,7-(8,93+0,748))-5,4813=5,53+(9,7--9,678)-5,4813=5,53+0,022-5,4813=0,0707=0