Viết các biểu thức dưới dạng lập phương của một tổng hoặc một hiệu:

a) A = ${\mathrm{m}}^6{\mathrm{p}}^3 – 3{\mathrm{m}}^4{\mathrm{n}}^3{\mathrm{p}}^2 + 3{\mathrm{m}}^2{\mathrm{n}}^6\mathrm{p} – {\mathrm{n}}^9$;

b) B = ${\left(\frac{\mathrm{x}}{2}+\mathrm{y}\right)}^3-6{\left(\frac{\mathrm{x}}{2}+\mathrm{y}\right)}^2\mathrm{z}+6(\mathrm{x}+2\mathrm{y}){\mathrm{z}}^2-8{\mathrm{z}}^3;$ 

c) C = ${(\mathrm{m} - \mathrm{n})}^3 + 15{(\mathrm{m} – \mathrm{n})}^2(\mathrm{m} – \mathrm{p}) – 75(\mathrm{n} – \mathrm{m}){(\mathrm{p} – \mathrm{m})}^2 – 125{(\mathrm{p} – \mathrm{m})}^3$.

MORE EXERCISE

Word Form :
\n1. This book is very __________________. (heavily)
\n2. The man works __________________ all day. (heavy)
\n3. I don’t like the __________________ of vehicles on the street. (noisy)
\n4. The music is very __________________. I can’t study. (noise)
\n5. These boys always do things __________________. (noisy)
\n6. That man is really __________________. (strength)
\n7. It will take you a few weeks to build up your __________________ again. (strong)
\n8. What is your __________________ food, Mai? (favor)
\n9. That room is decorated with many ____________________. (colorful)
\n10. How many _________________ are there in this flag? (colorful)
\n11. A young girl is ____________________ the picture in her room at present. (color)
\n12. We should eat fruit to stay ______________________. (health)
\n13. His sisters are ____________________. They’re strong. (gym)
\n14. Her _________________ drink is fruit juice. (favor)
\n15. Vietnamese people are really ______________________. (friend)
\n16. Minh and Nam are my close _____________________. (friendly)
\n17. We don’t like him because he’s _____________________. (friend)
\n18. Milk and fruit juice are _____________________ drinks. (health)
\n19. The old people live ____________________ in the countryside.
\n20. This is a busy shopping mall, full of activities and __________________. (colorful)