в равнобедреном треугольнике АВС с основанием ВС проведина высота ВМ =7,5см,угол МВС=15 градусов найти боковую сторону

14-x(Числитель)/4(знаменатель) + 3x+1(числитель)/5(знаменатель) = 3

Составьте уравнения реакций, которые необходимо провести, чтобы осуществить превращения :

а) H2 > HCl > Cl2 > PCl3

б) NaCl > ? > KCl > ? HCl

в) Сl2 > HСl > CuCl2 > FeCL2 > AgCl

спасите ) решите хотя-бы одно

Папа поручил Тане покрасить две пятых забораю Таня попросила сестру помочь ей, ита покрасила одну четвертую Таниной части. Какова длина забора, если сестра покрасила две целых одну вторую метра? Какую часть забра покрасила Таня? Пожалуйста решайте без иксов.

Margaret, the eldest of the four, was sixteen, and very pretty, being plump and fair, with large eyes, plenty of soft brown hair, a sweet mouth, and white hands, of which she was rather vain. Fifteen- year-old Jo was very tall, thin, and brown, and reminded one of a colt, for she never seemed to know what to do with her long limbs, which were very much in her way. She had a decided mouth, a comical nose, and sharp, gray eyes, which appeared to see everything, and were by turns fierce, funny, or thoughtful. Her long, thick hair was her one beauty, but it was usually bundled into a net, to be out of her way. Round shoulders had Jo, big hands and feet, a flyaway look to her clothes, and the uncomfortable appearance of a girl who was rapidly shooting up into a woman and didn't like it. Elizabeth, or Beth, as everyone called her, was a rosy, smooth- haired, bright-eyed girl of thirteen, with a shy manner, a timid voice, and a peaceful expression which was seldom disturbed. Her father called her 'Little Miss Tranquility', and the name suited her excellently, for she seemed to live in a happy world of her own, only venturing out to meet the few whom she trusted and loved. Amy, though the youngest, was a most important person, in her own opinion at least. A regular snow maiden, with blue eyes, and yellow hair curling on her shoulders, pale and slender, and always carrying herself like a young lady mindful of her manners. What the characters of the four sisters were we will leave to be found out. The clock struck six and, having swept up the hearth, Beth put a pair of slippers down to warm. Somehow the sight of the old shoes had a good effect upon the girls, for Mother was coming, and everyone brightened to welcome her. Meg stopped lecturing, and lighted the lamp, Amy got out of the easy chair without being asked, and Jo forgot how tired she was as she sat up to hold the slippers nearer to the blaze. "They are quite worn out. Marmee must have a new pair." "I thought I'd get her some with my dollar," said Beth. "No, I shall!" cried Amy. "I'm the oldest," began Meg, but Jo cut in with a decided, "I'm the man of the family now Papa is away, and I shall provide the slippers, for he told me to take special care of Mother while he was gone." "I'll tell you what we'll do," said Beth, "let's each get her something for Christmas, and not get anything for ourselves."