https://www.youtube.com/channel/UCoye4670ykyFlDBXWwLwmvA

muốn ôn toán hình thì vào ủng hộ mình nha 

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1.A new school was built in our village last year.

2.Millions of Christmas cards werre sent last month.

3. classroom is cleaned by students everyday.

4. This exercise must be done carefully.

5. that bridge has just been built in village. 

6. I will be taught by Mr. Nam next year.

2.4m.3 = 24m nhé

https://www.youtube.com/watch?v=toNMfaR7_Ns

2x^2  -(4m+3)x+2m^2-1=0

 a= 2

b = -(4m+3)

 c= 2m^2-1

Ta có: ∆=b^2-4ac

              = 〖(4m+3)〗^2-4.2.(2m^2-1)

              = 16m^2+24m+9-16m^2+8   

               = 24m +17

Để phương trình có 2 nghiệm phân biệt

Vậy để pt có 2 nghiệm phân biệt thì m > (-17)/24

https://www.youtube.com/watch?v=toNMfaR7_Ns