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Известно, что x1 и x2-корни уравнения x^2+3x+2=0 не решая уравнения найдите значение выражения x1^2+x2^2

Алгебра

Ответы

Светлана константин

вот как-то так по виета

murza2007

Сколько спаренных и неспаренных электронов содержат эти атомы? Сколько неспаренных электронов содержат ионы Fe2+, Cu2+, As3- ?

Задание №2

Расположите элементы в порядке увеличения:

а) металлических свойств - Se, Li, Br, Rb, Cr, K, Sc

б) электроотрицательности - As, Ge, S, Cl, O, P, Mg

в) радиуса атома - I, Zr, S, As, F, Te, N

Задание №3

Расположите высшие гидроксиды стронция, йода, молибдена, циркония и сурьмы в порядке убывания их кислотных свойств. Объясните причину такого изменения свойств гидроксидов. Приведите пример аналогичного изменения свойств на примере гидроксидов одного металла.

Задание №4

Используя правило Гунда, приведите электронные и

Puschdom

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Известно, что x1 и x2-корни уравнения x^2+3x+2=0 не решая уравнения найдите значение выражения x1^2+x2^2
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