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manhdungmydear
2 năm trước
Cho 24 số nguyên dương 1,2,3,....,24 chọn ngẫu nhiên 9 số bất kỳ chứng minh rằng trong 9 số đó tồn tại hai số a,b mà à+b là số chính phương
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Giúp em sửa ngữ pháp với ạ many years ago, it wasn't uncommon to see families with about 4, 5 and even 6 childrens. But as the years passed, people have been having fewer and fewer children. Why? The firstly is the considerable economic pressure on a young family, the cost of living, buying a house, food, power, water and other which in turn creates great considerations with thr decision to have a baby. In particular, the costs of preparinf and raising children are increasing, from food, clothing, school, medical and other expenses, so we must have foundation to think about having many children. Secondly, young people have a higher awareness of how to give birth and raise good children. Littles kids for better care. And another reason, modern women indentify the need to balance family life and other values such as career, personal life, health and beauty, so having fewer children is the right choice for them

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