Nội dung mới nhất bởi Ông Bụt

Bài 2. Đặt t = √(x2 - 2x + 2) = √[(x - 1)2 + 1]. Để x thuộc [0; 1 + √3] tức là 0 ≤ x ≤ 1 + √3, thì Với Minimum x = 0 thì t = √2 ; Với Maximum x = 1 + √3 thì t = 2. → √2 ≤ t ≤ 2. (1) ↔ m(t + 1) - (t2 - 2) ≤ 0. (2) Với Maximum t = 2 thì (2) ↔ 3m - 2 ≤ 0 ↔ m ≤ 2/3 ; Với Minimum t = √2 thì...

Bài 1. x4 - 4x2 + y2 - 6y + 9 = 0 <=> x2(x - 2)(x + 2) + (y - 3)2 = 0. ....{x = 0, y = 3 ; S1 {x = 2, y = 3 ; ....{x = -2, y = 3. x2y + x2 + 2y - 22 = 0 <=> (x2 - 4)y + (x2 - 4) + 6(y - 3) = 0 <=> (y + 1)(x - 2)(x + 2) + 6(y - 3) = 0 ....{x = 2, y = 3 ; S2 { ....{x = -2, y = 3. Có tập...

1. Nam didn't go to school yesterday because of headache. 2. I like to learn English because of international language. 3. I have to read this book because of its importance. 4. Everybody admires him because of his intelligence. 5. They can't finish the project on time because of rain. 6. He was...