Выполнение письменных упражнений 1. Преобразуйте выражение в тождественно равное ему, используя соответствующие свойства действий над числами: 1) -6,2a · 5; 2) 0,3 х · (-12у); 3) -23 · (2a – 3b + 1); 4) 1,5(-3x + 4y – 5z); 5) 13a + 7b – 2a – b; 6) -5,1 a – 4b – 4,9 a + b. 2. Выполните тождественные преобразования выражений: 1) x + (a – b) – (c + d); 2) a + (b – (c – d)); 3) (х – 1) + (12 – 7,5x); 4) 4(6 – 5х) + 17х – 10; 5) 0,2(3a – 1) + 0,3 – 0,6а; 6) -2,6(5 – с) – с + 8. 3. Является ли тождеством равенство (объясните, используя действия над числами): 1) ab + 16c = 16c + ab; 2) 5(b + c) = 5b + 5c; 3) a · 25b = 25ab; 4) (x – x)a = 0? 4. Запишите в виде равенства следующие утверждения: 1) произведение любого числа и нуля равно нулю; 2) сумма двух противоположных чисел равна нулю; 3) произведение двух чисел равно произведению чисел, им противоположных; 4) квадрат любого числа равен квадрату числа, ему противоположного. Есть ли записанные равенства тождественностями? Почему?

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kpilipaka02

10.04.2023 00:41

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WRITING Choose ONE of the topics and write. Topic 1: You are a charitable volunteer in your city and always give a hand to those who are in need: clean the apartments of the disabled people; bring food to animal refuges to feed homeless animals; organise campaigns to raise money and collect toys and clothes for the local orphanages. Your new idea is to write a formal letter to the local mayor to ask him/her for any help he/she can provide to help your charity organisation. Include in your letter the following information: • The title of your charity organisation: • What you have done/are doing aiready; • How you would like the mayor to help your charity organisation. Use appropriate style and examples in your letter.WRITING Choose ONE of the topics and write. Topic 1: You are a charitable volunteer in your city and always give a hand to those who are in need: clean the apartments of the disabled people; bring food to animal refuges to feed homeless animals; organise campaigns to raise money and collect toys and clothes for the local orphanages. Your new idea is to write a formal letter to the local mayor to ask him/her for any help he/she can provide to help your charity organisation. Include in your letter the following information: • The title of your charity organisation: • What you have done/are doing aiready; • How you would like the mayor to help your charity organisation. Use appropriate style and examples in your letter.WRITING Choose ONE of the topics and write. Topic 1: You are a charitable volunteer in your city and always give a hand to those who are in need: clean the apartments of the disabled people; bring food to animal refuges to feed homeless animals; organise campaigns to raise money and collect toys and clothes for the local orphanages. Your new idea is to write a formal letter to the local mayor to ask him/her for any help he/she can provide to help your charity organisation. Include in your letter the following information: • The title of your charity organisation: • What you have done/are doing aiready; • How you would like the mayor to help your charity organisation. Use appropriate style and examples in your letter.WRITING Choose ONE of the topics and write. Topic 1: You are a charitable volunteer in your city and always give a hand to those who are in need: clean the apartments of the disabled people; bring food to animal refuges to feed homeless animals; organise campaigns to raise money and collect toys and clothes for the local orphanages. Your new idea is to write a formal letter to the local mayor to ask him/her for any help he/she can provide to help your charity organisation. Include in your letter the following information: • The title of your charity organisation: • What you have done/are doing aiready; • How you would like the mayor to help your charity organisation. Use appropriate style and examples in your letter.WRITING Choose ONE of the topics and write. Topic 1: You are a charitable volunteer in your city and always give a hand to those who are in need: clean the apartments of the disabled people; bring food to animal refuges to feed homeless animals; organise campaigns to raise money and collect toys and clothes for the local orphanages. Your new idea is to write a formal letter to the local mayor to ask him/her for any help he/she can provide to help your charity organisation. Include in your letter the following information: • The title of your charity organisation: • What you have done/are doing aiready; • How you would like the mayor to help your charity organisation. Use appropriate style and examples in your letter.

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