1/z = 1/(5-3i) = умножим числитель и знаменатель на число 5+3i =
(5+3i)/((5-3i)(5+3i) = (5+3i)/(25+9) = 5/34 +3/34i.
Проверка: (5-3i) * (5/34 +3/34i) = 25/34 -15/34i +15/34i -9/34i² = 25/34 + 9/34 = 1.Ответ 5/34 +3/34 i.
(x-b+1)²+2(b-x-1)(x+b+1)+(x+b+1)² при b=0,4 и x=-4,019
(x-b+1)²+2(b-x-1)(x+b+1)+(x+b+1)²=(x-b+1)²-2(x-b+1)(x+b+1)+(x+b+1)²=[(x-b+1)-(x+b+1)]²=(x-b+1-x-b-1)²=(-2b)²=4b² 4*(0.4)²=4*0.16=0.64
Надеюсь Помогла ,Очень старалась!
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