đề thi gmat bằng tiếng anh

Ngày tải lên: 18/02/2014, 11:20

... Now that 16x + 1 = (x 2 − y 2 ) 2 = (x −y) 2 (x + y) 2 ≥ x 2 . From this we obtain the inequality, x 2 − 16x − 1 < 0. Solving this inequality gives x ∈ {0, 1, ··· ,16}. In addition, 16x + 1 is ... y) = |x − y| + |x 3 − y 3 | when x, y vary satisfying the restriction x 2 + y 2 = 1. Rewriting this as f(x, y) = |x − y|(1 + x 2 + xy + y 2 ) = |x − y|(2 + xy). from which we square to arrive ... xy 3  3 =  5 3  3 . Hence, f(x, y) ≤ 5 3 .  5 3 . Equality occurs when xy = − 1 3 , x 2 + y 2 = 1. This simultaneous equations are equivalent to xy = − 1 3 , x + y = 1 √ 3 . 5 Hanoi Open Mathematical...

Ngày tải lên: 18/02/2014, 11:20

... Đề thi trắc nghiệm tiếng anh bằng A-0048 1) The window was shut, and he ________ to open it. a) did even not...

Ngày tải lên: 28/07/2014, 00:21

... swimming c) swim d) to swim 6) There is nothing very ________ to do in that small town. a) enjoy b) enjoyable Đề thi trắc nghiệm tiếng anh bằng A-0047 1) ________ a letter here for...

Ngày tải lên: 28/07/2014, 00:21

... no c) any d) not 4) - What are you doing? - ________ . a) No b) None c) Not d) Nothing 8) Praja returned home as ________ as he could. a) quick b) quicker c) quickly d)...

Ngày tải lên: 28/07/2014, 00:21

... He b) We c) You d) They 7) This book belongs to me, and this pen is ________, too. a) his b) me Đề thi trắc nghiệm tiếng anh bằng A-0043 1) - Is this your handbag? - ________? a)...

Ngày tải lên: 28/07/2014, 00:21

... c) have d) got 3) - I haven't got anything for you. - ________! a) Never mind b) It isn't the matter c) Nothing d) Not problem 4) I often spend two hours ________ ... 6) Give it to ________. It's my pencil. a) I b) me c) my d) mine 7) I don't think he ________ flowers very much. a) like b) liking a) is b) it c) it's d) is...

Ngày tải lên: 28/07/2014, 00:21

... d) long 6) ________ your brother spend Christmas with you? a) do b) does Đề thi trắc nghiệm tiếng anh bằng A-0038 1) There isn't ________ left. a) enough sugar b) sugar enough ... how's d) when 9) Can you ________ on the light, please? a) switch b) switches a) these b) this c) those d) there 3) I'm tired ________ waiting for him. a) from b) for c) of...

Ngày tải lên: 28/07/2014, 00:21

... every d) The whole 9) We hire out bicycle ________. a) by hours b) by an hour Đề thi trắc nghiệm tiếng anh bằng A-0037 1) I live about twenty km ________ here. a) away of b) away from c)...

Ngày tải lên: 28/07/2014, 00:21

... Good-bye c) Good evening Đề thi trắc nghiệm tiếng anh bằng A-0036 1) You must ________ your work as soon as possible. a) started b) start c) to start d) to start to 2) This man has a ________....

Ngày tải lên: 28/07/2014, 00:21

... I ________ it already. a) have seen b) was seeing c) had seen d) had see Đề thi trắc nghiệm tiếng anh bằng A-0035 1) My sister won ________ money in the lottery. a) much b) a big...

Ngày tải lên: 28/07/2014, 00:21

Ngày tải lên: 28/07/2014, 00:21

Ngày tải lên: 28/07/2014, 00:21