a, -9x^2y+6x^3+x^2-6xy^2-2xy

b, -3x^2+4xy -2x

a, Bậc 3, Hạng tử: 2x^2y;-3x;8y^2;-1

b,5

c,P+Q =4xy^2-3x^2+9x^2y+5

P-Q=6xy^2- 3x^2+4y-7-9x^2y

a, 5x^2y-3x+1

b, x^3-6xy-3

a, x=2

b, x= 17/ 12

a,Tứ giác BHCK là hình bình hành

b,vì BHCK là hình bình hành nên 2 đường chéo bằng nhau và cắt tại trung điểm của mỗi đường . M là trung điểm BC nê đường chéo HK cắt BC tại M . Suy ra H,M,K thẳng hàn

a, 1,2xy+1,5*5x*5y (m3)

b, 464,4 (m3)

Dear, my penfriend

I am going to tell you about i usually do with my friends in my free time. My friends and i usually play board games with eachother. Because games like chess and Monopoly boots my intelligent. Moreover, it sharpens my memory and develops soft skills. Board games are fun and deepen our friendship. In addition, it also help me to improve my speaking skill and help me to be more confident. And what about you? What do you usually do with your friend in your freetime? I can't wait to recive your email !

Your dearest friend.

1. I usually spend time with my friends and family in my free time.

2. I usually play board games like chess and Monopoly with my friends in my free time.

3. I do these activities because it boots my intelligent, fun, relaxing and it helps me comunicated with other people.

keen on cooking

Topic 1:

I live in a beautiful house. There are four rooms in my house. The living room has a grey sofa and a soft rug and a big window. I read comic books there. Upstairs there are two bedrooms. One for my father and mother and the other one is for me and my sister.