b/ x² = 125                                c/ x² = 144

    x² = 5²                                              x² = 12²

=> x = 5 hoặc x = -5                   => x = 12 hoặc x = -12

Rồng bay ở Thăng Long, đáp ở Hạ Long

1. Why does she try to work hard?

2. When did you buy this can?

3. Where will you watch firework next week?

4. What is the distance between Ha Noi and Hai Phong?

5. How long have you lived in Paris?

6. How far is it from here to the neavest maket?

7. What time will you meet together in Vo Nguyen Giap Square?

45,85 : 25 x 0,001 + 78,1 – 3,3

= 1,834 x 0,001 + 78,1 – 3,3

= 0,001834 + 78.1 – 3.3

= 78,101834 – 3,3

= 74,801834