Ответ:
175. Удобный порядок сложения
\(3,46 + (-2,63) + (-5,46) + 2,63 = (3,46 + (-5,46)) + ((-2,63) + 2,63) = -2 + 0 = -2\)
\(-5,34 + (-2,72) + 4,34 + 6,72 = (-5,34 + 4,34) + ((-2,72) + 6,72) = -1 + 4 = 3\)
\(3,46 + (-2,63) + (-5,46) + 2,63 = (3,46 + (-5,46)) + ((-2,63) + 2,63) = -2 + 0 = -2\)
\(-5,34 + (-2,72) + 4,34 + 6,72 = (-5,34 + 4,34) + ((-2,72) + 6,72) = -1 + 4 = 3\)