447. Вычислите рациональным способом:
1) -1,2 - 2,2 - 3,2 - 4,2 - 5,2 + 4,2 + 3,2 + 2,2 + 1,2;
2) (3,4 - 5) + (4,4 - 7) + (5,4 - 9) + (6,4 - 11) + (7,4 - 13);​
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