Ответы на вопрос:
2/3 - 3/5 = 10/15 - 9/15 = 1/15 5/6 - 1/4 = 10/12 - 3/12 = 7/12 7/9 * 2/5 = 14/45 14/15 * 10/49 = (2*2)/(3*7) = 4/21 4/15 : 2/5 = 4/15 * 5/2 = (2*1)/(3*1) = 2/3
А) (6-2i)+(9+3i) = 6+9 -2i + 3i = 15 + i б) (-5+2i)^2 = (-5)^2 + 2*(-5)*2i + (2i)^2 = 25 -20i -4 = 21 - 20i
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