646. Вычислите рациональным способом:
1) 1,1 + 1,3 + 1,7 + 1,9:
2) (5,781 + 9,37) - 4,781;
3) 4,2 + 5,5 + 9,8 + 32,5; 4) (3,23 + 8,596) + 8,77;
5) 11,101 - (5,4 + 0,101); 6) 8,123 - (2,123 + 1,8);
7) (9,5 + 1,8 + 1,39) + 0,5 + (0,61 + 5,2);
8) 0,715 + 2,83 +4,285 + 0,17.​
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