Bella

12 Mark the letter A, B, C or D to indicate the most suitable response to complete each of the following exchanges. “My favorite leisure activity is

Bởi

12 Mark the letter A, B, C or D to indicate the most suitable response to complete each of the following exchanges. “My favorite leisure activity is people watching.” “_______” A. OK. That’s very kind of you B. Sure. It’s very entertaining. C. That’s all right. D. That sounds so weird! 13 Choose the best … Đọc tiếp

ta có: y = x- $\frac{2x}{x+2}$= $\frac{x^2}{x+2}$ = $\frac{1}{2}$.x . $\frac{2x}{x+2}$ (1) từ y = x- $\frac{2x}{x+2}$ ⇒ $y^2$ = (x- $\frac{2x}{x+2}$

Bởi

ta có: y = x- $\frac{2x}{x+2}$= $\frac{x^2}{x+2}$ = $\frac{1}{2}$.x . $\frac{2x}{x+2}$ (1) từ y = x- $\frac{2x}{x+2}$ ⇒ $y^2$ = (x- $\frac{2x}{x+2}$)^2 ⇒$y^2$ = $x^2$ -2.x.$\frac{2x}{x+2}$ + $\frac{4x^2}{(x+2)^2}$ (2) từ (1)và (2) ⇒$y^2$ = $x^2$+$\frac{2x}{(x+2)^2}$ -2.2y ai làm rõ lại giúp em phần từ 1 và 2 suy ra với