1/2-1/3+1/3-1/5+1/5-1/6+1/6-1/8+1/8-1/10+1/10-1/12+1/12-1/13

=1/2-1/13

=6/13

s,đ,s,đ

Bạn làm sai rồi

6x6-2x2

=(6x2)-(6x2)

=12-12

=0

                                       THAM KHẢO!

46.Would you like to come to my house for lunch next Sunday?

47.Her mother prefers living in the country to living  the city.

48.It took my brothers three months to learn how to swim.

49.Many plants and animals are in the danger people are destroying them

50. She needs to buy a bottle of cooking oil and half a kilo of beef.