Вычислите наиболее удобным способом: 2) -2 3/4 +(+ 6,8) + (- 1,25) + (+ 3 1/5) 3) - 5 1/6 + (+ 7 1/9) + (-4 1/3) + (-7 1/9)
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3) - 5 1/6 + (+ 7 1/9) + (-4 1/3) + (-7 1/9) = -5 1/6 + 7 1/9 - 4 1/3 - 7 1/9 = -31/6 + 64/9 - 13/3 - 64/9 = -31/6 - 13/3 = -31/6 - 26/6 = -57/6 = -9 3/6 = -9 1/2