Hong bé ơi

1 What do they like to do on weekends

2 Where is the club?

3 What is their favorite kind of music?

4 What are they playing 

5 What time did the train arrive

6 How long does it take you to go to the supermarket by motorbike ?

7 What color is your new dress?

8 When did Tom begin playing football?

9 How long has jane been living in this city?

10 How much does your younger sister weigh?

11 By whom was this novel written

a/ △= b^2-4ac

= 4(m+2)^2-4(2m^2+7)= -4m^2+16m-12

Để phương trình có nghiệm kép thì △=0

hay -4m^+16m-12=0

<=> m=3 và m=1

b/

△=b^2-4ac=4(3m-2)^2-4(m+2)(m+2)

=32m^2-44m

Để phương trình có nghiệm kép thì △=0

hay 32m^-44m=0

<=>m=11/8 và m=0

c/ △=b^2-4ac

= (2m+3)^2-4m^2

=12m+9

Để phương trình có nghiệm kép △=0

12m+9=0

<=>m=-3/4

Ai cho tớ lên tân binh đi