Ответы на вопрос:
1) -0,5 : 2/3 - (-0,5) * 2/3 = -5/12 -1/2 : 2/3 = -3/4 -0,5 * 2/3 = -1/3 -3/4 + 1/3 = -5/12 2) 2/7 + (-4/9) : 2/7 - (-4/9) = -11/63 -4/9 : 2/7 = -5/9 2/7 - 5/9 = -17/63 -17/63 + 4/9 = -11/63
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