I) 1.My father's favourite sport is tennis.

=>My father likes tennis.

2.My mother is a fast swimmer.

=>My mother swims fast.

3.Lien doesn't like doing sport very much.

=>Lien isn't very interested in doing sport very much.

4.Minh plays football very well.

=>Minh is very good at playing football.

5.We do a lot of outdoor activities in summer.

=> We take part in a lot of outdoor activities in summer.

con chuột nói với con voi là: "anh voi ơi, em có thai với anh rồi"

ta có:N(x)=5x^2+9x+4=0

5x² + -5x - 4x + 4 = 0

(5x² - 5x) + (-4x + 4) = 0

5x(x - 1) - 4(x - 1) = 0

(x - 1)(5x - 4) = 0

x - 1 = 0 hoặc 5x - 4 = 0

x = 1 hoặc  x = 4/5