определите сначала знак а затем найдите значение выражения

1)-6,8 + 2,5; -6,8 - 2,5; +6,8 - 2,5; +6,8 +2,5

2)-4,27 - 7,3; -4,27 + 7,3; 4,27 - 7,3; 4,27 + 7,3
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