вычислить: 1) 7сут.6ч.-5сут.8ч.=? 2) 35 м.кв.70см.кв.-90дм.кв.=? 3) 4ц. 86кг.*13=? 4)15км.кв.-20га=? 5) 14км. 490м./18=? 6) 2ч. 5мин.-55 мин.=?

1. Найдите наименьший целый корень уравнения: (x2-6x)(x2-6x+4)-5=0 2. Концентрация первого соляного раствора равна 20 %, а второго-50%. Объем первого раствора на 6 литров больше, чем второго.Когда оба раствора слили в одну ёмксть, концентрация раствора стала 26 %. Найдите объем полученного раствора. 3. Найдите радиус основания конуса, у которого длина образующей равна 5, а площадь боковой поверхности-8 Пи

Проверьте пожалуйста сочинение. Как грамматику и потсроение предложений, так и оформление.

                                                                                                                                         Moscow

                                                                                                                                            Russia

                                                                                                                                         06\05\13

Dear Tom,

Thank you for your letter. I'm really sorry for not writing so long, I had problem at school. But now everything is OK.

 In your letter you writing about young people, who want to not relying on their parents. So, many of my friends and Russia`s teens want to start new life after they finish school. In the other word, they dream about buying their own flats, but I haven't this kind of dream, I want to live together with my family while I get married. And in fact, it's very expensive to rent a house in my country.

 I hear about your trip in Scotland, it's so interesting! Did you see a Lohness lake? That towns did you visit in Scotland? And who did travel with you?

Keep in touch.

Best wishes,

Julia

Расположите вещества,формулы которых C2H5---------NH2,NH3,(C6H5)2NH и C6H5NH2, в порядке усиления основных свойств.Поясните ответ.