3x^2yz + 6xyz=3xyz(x+2)
5(x+2)-x^2-2x=5(x+2)-(x^2+2x)=5(x+2)-x(x+2)=(x+2)(5-x)
x^2+2xy+y^2-2^2=(x+y)^2 -2^2=(x+y+2)(x+y-2)

x=1 nha bạn

B.2

C

B

là câu B

1. regularly learn vocabulary, should learn from five to ten words a day after two to three weeks, then check all of them, and must remember we should learn vocabulary systematically
2. Learn listening skills through watching TV, youtube about English movies, English animation. Learn speaking skills by communicating in English often with friends and people. Learn grammar and vocabulary skills by reading English comics, or English books.
3. we can choose to study or rest at will, but not more than two days off.
4. Determine which learning style is right for you.

giúp kiểu?? không có đề mà

50cm