Выберите неверное утверждение. а) сумма кубов трёх последовательных натуральных чисел всегда кратна 3 2)разность квадрата любого натурального числа и самого этого числа всегда является четным числом 3) модуль разности квадратов двух последовательных натуральных нечетных чисел всегда равен удвоенной сумме этих чисел 4) квадрат любого нечётного числа всегда кратен 2

4не верно . например 3 в квадрате 9. 9 не кратно 2

4) квадрат любого нечётного числа всегда кратен 2

Объяснение: Уравнение эллипса (x^2 / a)  +  (y^2 / b) = 1, где а - полуось, располагающаяся на оси Ох, а b - полуось, располагающаяся на оси Оу

1) По условию b = 1/2 * 4√7 = 2√7, т.к. фокусы лежат на оси Оу

с - половина расстояния м/ду фокусами

F1F2 = √((0-0)^2 + (√3 + √3)^2) = 2√3

c =  1/2 * 2√3 = √3

c^2 = b^2  - a^2

a = √(28 - 12) = 4

Уравнение примет вид:

(x^2 / 16)  +  (y^2 / 28) = 1

2) 1) a = 5, b = 3

длины осей эллипса 2a = 10, 2b = 6

Координаты вершин: A1 (-5;0) A2 (5;0) B1(0;-3) B2(0;3)

2) a = 4, b =9

длины осей эллипса 2a = 8, 2b = 18

Координаты вершин: A1 (-4;0) A2 (4;0) B1(0;-9) B2(0;9)

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Объяснение: