3.musicians

2.colorless

1.famouse

1 .careless (chuyển thành) carelessly

2.cutted (chuyển thành) cut

3.bỏ (more)

mary is from england and she is a visitor

0

thấy cái bàn cờ vua

3x + 5y = 7 => x = \(\frac{7-5y}{3}\)

=> \(x^2+y^2=\frac{\left(7-5y\right)^2}{9}+y^2=\frac{49-70y+25y^2+9y^2}{9}=\frac{34y^2-70y+49}{9}\)

34y² - 70y + 49 = 34. (y² - 2.y. \(\frac{35}{34}\) + \(\left(\frac{35}{34}\right)^2\)) - \(\frac{35^2}{34}\) + 49 = \(34.\left(y-\frac{35}{34}\right)^2+\frac{441}{34}\)

=> \(x^2+y^2=\frac{34}{9}\left(y-\frac{35}{34}\right)^2+\frac{49}{34}\ge0+\frac{49}{34}=\frac{49}{34}\)

Dấu "=" xảy ra <=> y = 35/34 ; x = 21/34

cần lấy 7 bì thư

b)x=0;1