bài 1 :

a/ 4x^2-(x+3)(x-5)+x

b/ X(x-5)-3x(x+1)

c/(x-1)(x+2)-(x+5)(x-2)

d/ (-x-2)(x+1)-(x-5)(-x+1)

A(x)=3(x² +2-4x)-2x(x-2)+17

1.A masquerade is a ______________ gathering of people wearing masks. (festival)

2.We went out for a ______________ dinner at a nearby beach restaurant. (celebrate)

3.______________ in a lion dance outfit show off their moves at the Rio Carnival. (perform)

4.The Rio Carnival Samba ______________ are known as the greatest show on Earth! (parade)

5.A music festival includes live ______________ of singing and musical instrument playing. (perform)

6.Hue Festival is a ______________ event that is held every two years. (culture)

7.New Year’s Eve is one of the largest global ______________ because it marks the last day of the year. (celebrate)

8.The Saint Patrick’s Day marchers were ______________ up Fifth Avenue. (parade)