cho 13,6 g hon hop gom ruou etlen va axit axetic tac dung voi na du sau phan ung thu duoc 2,8 lit khi h2

khong giai phuong trinh hay tinh

\(\frac{x_1}{x_2+1}+\frac{x_2}{x_1+1}\)

Cho đương thảngd cắt (O;R) tại C và D. M là điểm di động trên d (M ngoài đường tròn và MC < MD ). Vẽ hai tiếp tuyến MA , MB (A và B là hai điểm ) , H là trung điểm CD

1. Chứng minh MIHF và OHEI là các tứ giác nội tiếp

2. Chöùng minh MA2 = MC.MD

3. Chöùng minh CIOD noäi tieáp

4. Chöùng minh 4IF.IE = AB2

5. Chöùng minh khi M di ñoäng thì ñöôøng thaúng AB luoân ñieåm qua ñi

\(\sqrt{x-2}\left(x-3\right)\left(x-1\right)=0\)

Cho hàm số bậc nhất y=-x-2 có đồ thị là đường thẳng d

A. Trong mặt phẳng tọa độ Oxy, hãy vẽ đường thẳng d

B. Hàm số y=2mx+n có đồ thị là đường thẳng d'. Tìm m,n để hai đường thẳng d và d' song song với nhau.

II/ Combine these pairs of sentences, using “ Who, Whom, Which, Whose, That”

1/ The lesson is not easy. The teacher is explaining the lesson.

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2/ The man is very rich. He is talking to my father.

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3/ I have just bought a new computer. Its screen is very good.

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4/ Easter is a festival. It occurs in late March or early April.

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5/ Mrs Nga is a famous tailor. She is very much interested in fashion.

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6/ The Taj Mahal is one of the wonders. We visited it last week.

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7/ Tom and his sister didn’t come to the party. They were invited.

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8/ The shoes are too large. My teacher is wearing them.

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9/ This is the best movie. I have never seen it before.

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10/ Lan’s father is very tall and thin. He teaches us Chemistry.

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11/ The woman has no child. The students helped her yesterday.

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12/ Your father told me you were away He answered the phone.

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13/ The letter is from America. I’m reading the letter now.

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14/ He bought a picture. It is very valuable.

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15/ The student is an excellent one. I borrowed his bike yesterday.

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16/ The boy is an orphan. I gave him some books last week.

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17/ Where is the girl? She sells the fruit.

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18/ The readers must have library cards. They want to borrow books from the library.

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19/ Viet Nam exports rice and coffee. It is in south-east Asia.

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20/ Neil Armstrong lived in the USA. He first walked on the moon.

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21/ .Kangaroos have long tails. They come from Australia.

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22/ My grandfather likes going fishing. He is over seventy.

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23/ It is the first idea. It comes in my mind.

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24/ There’s somebody. He wants you on the phone.

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bine these pairs of sentences using where which who whom whose that

1)the lesson is not easy the teacher is explaining the lesson

2) the man is very rich he is talking to my father

cho cac phuong trinh x^2 +(2m-1)x+m^2-2m=0

tim m de phuong trinh co hai nghiem trai dau

write sentences as directed

1)i think it would be a good idea to collect plastic bags

i suggest

2)he/give/smoke/if/son/ask/do/so/ (make a sentence )

3)the waiter wasn't very nice .the food was delicious(so ,but ,however)

dung tu goi y hoan thanh cau

1)the teacher /wanted/ student /listen/ new/careful

2) i/suggest/turn/off/lights/in the classroom