вычислить значение суммы, представив в виде суммы разность:
1) 8 - 18, 8 - (-18), -8 - 18, -8 - (-18)
2) 13 - 9, 13 - (-9), -13 - 9, -13 - (-9)
Заранее Спасибо!)
1) 8 - 18, 8 - (-18), -8 - 18, -8 - (-18)
2) 13 - 9, 13 - (-9), -13 - 9, -13 - (-9)
Заранее Спасибо!)
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1)
8 - 18 = 8 + (-18) = -10
8 - (-18) = 8 + (-(-18)) = 8 + 18 = 26
-8 - 18 = -8 + (-18) = -26
- 8 - (-18) = -8 + (-(-18)) = - 8 + 18 = 10
2)
13 - 9 = 13 + (-9) = 4
13 - (-9) = 13 + (-(-9)) = 13 + 9 = 22
-13 - 9 = -13 + (-9) = -22
-13 - (-9) = -13 + (-(-9)) = -13 + 9 = -4