Cho hai số hữu tỉ a/b và c/d (b,d > 0) Chứng Minh Nếu ad < bc tì a/b < c/d Cảm ơn :V

Vẽ avatar cặp đôi cute !! Nhanh mọi người!! Cảm ơn nhìu! Ko spam nhé,vẽ full màu, full người ,kèm chữ kí nhaaaaaaaa!!!!!

Làm giúp mình bài D1) trang trước và trang sau nhé, Bài 2 nữa mình sẽ cho ctlhn nhé

Best english giúp mình cần sửa gì không ạ. Đề: Describe a family member. I’ve chosen to talk about my mother who is an important part of my life. She is now 47 years old and she lives with my family as a housewife. She has a medium height, about 163 cm and she weight about 58kg. I think it’s a fit body. For me, my mother is so beautiful, she looks pretty younger than her age with short-wavy hair and bangs. She likes clothes, especially cosy long dresses. She always looks pretty whenever she goes out. In her spare time, she’d like to cook, watch TV or meet her friends. My mom likes pork, bean-sprouts and cola and she doesn’t like giblets and sweeties. My mother is really kind and a little straightforward. She usually wants to show her opinions about things to people. Anyways, she’s a caring person. She does almost housework and always takes care of my family. I feel warmly whenever i stay with her. So, if I had to talk about a person who i love most, it would have to be my mother. Cảm ơn nhiều ạ ^^

B= ( x^2- 2) ( x^2 +x-1 )-x ( x^3+x^2 -3x-2)

Làm giúp em 5 khác nhau câu phần này vs ạ

giúp mình 3 đề vs hứa vote 5 sao

y=-x^3-6x^2+(4m-9) +10 nghịch biến (-00;-1), tìm m nhe?

Bài này mk ko bt làm giúp mk vs ạ

Tìm cực trị của hàm số y= 2x-1/căn x^2-4x