\(cos^290\) + \(cos^290\)

Tính giúp em phép tính trên với ạ.

To some, the wearing of jewellery for adornment may appear self-indulgent. If (1)_____, it is a self-indulgence common to all ages and all places. (2)_____ prehistoric times crude necklaces and bracelets were (3)_____ fashioned from leather or reeds and strung with berries, pebbles, feathers, shells or animal bones, and decorative thorn or sharp bones were used (4)_____ clasps. They may have complemented the caveman's fur outfit (5)_____ been wron as part of a religious ceremony, to indicate superior rank and even as amulets to ward off bad luck. Gradually, ivory, wood and metal took over from (6)_____ durable materials, and ears, noses and lips (7)____ pierced for the insertion of ornaments. (8)_____ 3500 BC, the discovery (9)_____ gold heated with fire could be pounded into thin sheets and shaped (10)_____ objects had revolutionised jewellery-making. Similarly, silver, copper and bronze were now being used. In the late 2000s BC the Egyptians began inlaying jewellery with glass, enamel and precious gemstones, some of (11)_____ were believed to posses magical properties or bring the wearer good them. Slightly later, the Greeks (13)_____ in for fine filigree metalwork, twisting gold into intricate patterns and rarely using precious stones. (14)____ later were reinstated by the Romans, who (15)_____ have been the first to use jewelled rings as engagement tokens. 

(Bài điền từ ạ. Em định chia nhỏ ra để cho mọi người dễ làm nhx nó là một đoạn luôn nên em ko bt chia. Mọi người thông cảm và giúp em với ạ)

In 1969, Neil Armstrong was the first man to land on the moon. If earthlings can take part in intergalactic travel, then why can't life forms from other planets do the same? Is Earth the only inhabited planet in the universe? How can we be so sure of (1)____ the existence or the non-existence of extraterrestrial life? 

On 24th June, 1947, Kenneth Arnold reported seeing nine silvery objects moving rapidly through the sky near Mount Rainer, Washington. Obviously he had no proof (2)____ than his testimony, but this sparked (3)_____ an epidemic of apparent spottings of "unidentified flying objects". In June and  July of the same year, a (4)____ of 850 sightings of spaceships were reported.

Ufology had (5)____ root and was spreading prolifically. The lastest Gallup poll conveyed that twenty percent of the British and sixty percent of the American populations believed in the existence of UFOs. In (6)_____, a French group claimed that we only hear (7)____ one in every38,400 alien visits to Earth. Clearly, these figures do not prove the exstence of life (8)____ in the cosmos, but they prove that belief in humanoids is international and widespread.

(Điền từ ạ)

Anton Chekhov was a Russian playwright and short story writer born in Taganrog in 1860. In 1879, he became a medical student in Moscow, later qualifying (1)_____ a doctor. With a needy family to support, Chekhov (2)_____ to writing, contributing short humorous stories and sketches (3)_____ popular newspapers. His major work (4)_____ to come towards the end of his short life -- Chekhov died of tuberculosis in 1904 -- his reputation resting chiefly (5)____ four plays, The Seagull, Uncle Vanya, The Three Sisters and The Cherry Orchard, written in 1896, 1899, 1901 and 1904 (6)_____ All four workers, while gloomy and pessimistic (7)_____ tone, blend a poetic atmosphere (8)_____ a sympathetic treatment of characters (9)_____, unable to break (10)_____ of the vicious circle that they find (11)_____ in, are trapped in unfulfinglling lives which they feel (12)_____ powerless and dispirited to change. They (13)____ be regarded as symbolic (14)_____ the torpor and stagnation of late nineteeth century Crarist Russia. (15)____ realism is a product of Chekhov's scientific traning and experience as a provincial doctor. They remain masterpieces of Rusian literature


(Bài điền từ ạ)

\(\dfrac{x}{2}-\dfrac{7}{5}=\dfrac{x}{2x-5}\)

Tìm nghiệm của pt trên

-3|x|+ 3 >0 có là bất pt bậc nhất 1 ẩn ko? Giải thích (bắt buộc)