x¹⁰ =x¹ => x = 1 và 0

x¹⁰ =x > x = 1 hoăc 0

( 2x-15)⁵ = (2x-15)³ = > x=8

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that bestfits each of the numbered blanks from 25 to 29. Fill in the appropriate word in question 28

WOMEN TAKING THE HUSBAND’S NAME

        Many women in Western society, aware of the power of names to influence identity, are aware that choosing how to identify themselves after marriage can be a significant decision. They may follow the tradition of taking their husband's last name, hyphenate their (25)_____ name and their husband's, or keep their birth name. One fascinating survey reveals that a woman's choice is (26)_____ to reveal a great deal about herself and her relationship with her husband. Women who take their husband's name place the most importance (27)_____ relationships. On the other hand, women who keep their birth names put their personal concerns ahead of relationships and social expectations. Female forms of address influence others'

perceptions as well. Research (28)_____ in the late 1980s showed that women who choose the title Ms. give the impression of being more achievement oriented, socially self-confident, and dynamic but less interpersonally warm than counterparts (29)_____ prefer the more traditional forms Miss or Mrs.

A. conduct

B. conducts

C. conducting

D. conducted

Read the following passage carefully and then choose the best option to fit each space. Identify your choice by circling letter A, B, C or D on the answer sheet.

          The 18^th-century battlefield was, compared with that of the 20^`th-century, an intimate theatre, especially intimate in the (19)___ of the Revolution, which was usually small even by the standards of the day. Soldiers had to come to close quarters to kill; this fact reduced the mystery of the battle, though perhaps not its terrors. But at least the battle field lost some of its impersonality. In fact, in (20)___  to (with) the 20^1h-century combat, in which the enemy usually remains unseen and the source of incoming fire unknown, in the 18^1h-century battles the enemy could be seen and sometimes even (21)___ . (22)____ one's enemy may have arose a singular (23) ____of feeling uncommon in modern battles. Before the (24)___ occurred tension and anxiety (25) _____ up as the troops marched from their column into a line of attack. The ( 26) ____ of their movements was well understood by themselves and their enemies, who must have watched with feeling of dread and fascination. When the order came sending them (27) ____ rages, even madness replaced the attacker's (28) ____, while terror and desperation filled those who received  the charge.

Điền vào số (27)

A. upward           

B. outward            

C. forward            

D. downwad