6. Выполните действия. 1) (- 5 + 19) + (- 19) 3) - 78 + 36 + 19 + (- 22) + (- 25) 2) (- 16 + (- 17)) + 17 4) 43 + (- 60) + 12 + 39 + (- 21)
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