K₂O : Kali oxit - phân loại:oxit bazơ

CuO : Đồng (II) oxit - phân loại:oxit bazơ 

N₂O₃: đinitơ trioxit - phân loại:oxit axit 

Cu₂O: Đồng (I) oxit - phân loại:oxit bazơ

Fe₂O₃: Sắt (III) oxit - phân loại: oxit bazơ

MgO: Magie oxit - phân loại:oxit bazơ

CaO: Canxi oxit - phân loại:oxit bazơ

BaO: Bari oxit - phân loại:oxit bazơ

Na₂O: Natri oxit - phân loại:oxit bazơ

FeO: sắt (II) oxit - phân loại:oxit bazơ

P₂O₅: điphotpho pentaoxit - phân loại:oxit axit 

N₂O₅: đinitơ pentaoxit - phân loại:oxit axit 

SO₃: lưu huỳnh trioxit - phân loại:oxit axit 

CO₂: cacbon đioxit - phân loại:oxit axit 

MnO : Mangan (II) oxit - phân loại:oxit bazơ

Fe₃O_4: Sắt (II,III) oxit - phân loại:oxit bazơ

ZnO: kẽm oxit - phân loại:oxit bazơ

Al₂O₃: Nhôm oxit - phân loại:oxit bazơ

PbO: Chì (II) oxit - phân loại:oxit bazơ

If you have a toothache, you should go to the dentist to check your toothache.

vii. fill in a suitable word the smoke signals used (..1..) american indians did not convey the complex messages seen in hollywood movies. smoke signals (..2..) in fact used by the semi-nomadic tribes of the great plains. however, their content was limited (..3..) a few simple messages whose meaning had been agreed upon in (..4..). for example, piman warriors in arizona who had just finished a successful raid might send up a column of (..5..), and the village would reply with two columns of smoke. smoke signals (..6..) most commonly used to broadcast news of victory in battle, or to warn of sickness in a camp or dangers (..7..) as approaching enemies. fires fed (..8..) damp grass or boughs of evergreen sent up the one or two simple, unbroken columns of smoke needed to send a message. the place that the signal comes from - (..9..) on a hill or in a valley - conveyed most of the meaning. when apaches out hunting spotted another group of indians in the distance, they (..10..) a fire conspicuously to the right of their own party that meant “who are you?”.

In one of the large (..1..) of China there once lived a tailor, (..2..) name was Mustafa. Mustafa was very poor, and he found (..3..) hard to provide food (..4..) himself, his wife and his (..5..) child, Aladdin. Aladdin was a very naughty and lazy boy. He (..6..) never do (..7..) his parents wished (..8..) to do, but played in the streets from morning till night with boys (..9..) were as naughty as himself. When Aladdin was old (..10..) to learn a trade, his father took him into his (..11..) shop and began to show him (..12..) he should use the needle. It was a complete (..13..) of time. Aladdin had had his way for so long now that he could not settle (..14..) to work. His father (..15..) many hours trying to (..16..) him to change his ways, but Aladdin took no (..17..) of anything he said. Worn out, Mustafa became ill and died shortly afterwards. The poor widow thought that her son would now (..18..) an effort to earn a little money, but Aladdin was as idle as ever. In despair, the good woman sold all the things (..19..) the shop, and with the money and a little she could earn by spinning she managed to get (..20..)

Điền từ vào chỗ trống

chứng minh p² -1 chia hết cho 24

tìm GTNN của biểu thức A= |3x- | + |5 - 3x|