Exercise 15
1. There has been an outbreak of racial(violate)................ in the South of the Spain recently.
2. The soldiers were responsible for the(die)...................... of many civilians in the South of the country.
3. The company's director lacks(lead)........................ skills.
4. Sugar is(harm)........................ for your teeth bc it sticks to them causing plaque and decay.
5. The first key to beating drug(addict).................... lies in understanding it and indetifying its causes.
6. Mounir Alhamdaoui holds joint(citizen).................... in Morocco and Holland.
7. My daughter Hajar received many(give)............... for her birthday.
8. It is(law)............. to drive a car if you don't have a driver's licence.
9. Taha Hussein lost his(see)................. at an early age.
10. His behaviour is often(child).............. and this makes me angry.

Cho hình thang ABCD (AB//CD), E là trung điểm của AD. Đường thẳng qua E và song song với BC cắt AB và CD ở 7 và K. Chứng minh S_ABCD = S_BIKC

Rút gọn biểu thức:

a) A = ( 5 a   +   5 ) 2   +   10 ( a   –   3 ) ( 1   +   a )   +   a 2   –   6 a   +   9 ;

b) B = ( x − 1 ) 2 4 + x 2 − 1 + ( x + 1 ) 2 .