câu 1 : chứng minh pt sau có vô số nghiệm a) 5(x+2)=2(x+7)+3x-4 b) (x+2) ² = x ² +2x+2 (x+2) câu 2 : giải các pt: a)7x-8=4x+7 b) 2x+5= 20-3x c) 5y+12=8y+27.

Giúp mk vơi vả năm câu nha mn oiiii

Trò chơi điện tử, game cũng là nguyên nhân ảnh hưởng đến kết quả học tập của học sinh. Em hãy viết một đoạn văn ngắn chứng minh vấn đề trên.

sau cuộc khởi nghĩa Hai Bà Trưng tại sao nhà Hán đưa người Hán sang thay người Việt cai quản cấp huyện?

Câu 3: 3 phút 24 giây =……….phút A.3,24 B.3,4 C.32,4 D.0,24

Cho biết tình hình thế giới sau cuộc khủng hoảng kinh tế năm (1929-1933).Tại sao nói: Chủ nghĩa Phát xít xuất hiện và kết quả nặng nề của cuộc khủng hoảng kinh tế (1929-1933)?

Đặt 5 câu trong đó 1 câu có chứa phó từ chỉ quan hệ thời gian, 1 câu có chứa phó từ chỉ mức độ, 1 câu có chứa phó từ chỉ sự phủ định, 1 câu có chứa phó từ chỉ sự cầu khiến, 1 câu có phó từ chỉ sự tiếp diễn tương tự, gạch chân và xác định ý nghĩa của các phó từ đó.

20 Combine two sentences into a new one, using the words in brackets. Do not change the given words in any way. Write the new sentences on your answer sheet. Question 24. It’s no good being impatient with small children. (should) A: We ought to be patient with small children. B: We have to be patient with small children. C: We should be patient with small children. D: We must be patient with small children. 21 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 best fits blank (20). Tran Dai Nghia (1913-1997) - The Buddha of Guns Professor, Academician Tran Dai Nghia is a (17) ______ scientist of Vietnamese intellectuals. In 1935, the young man Pham Quang Le, his real name, had a scholarship (18) ______ in France. He tried to take 6 college degrees and certificates of the most famous universities of France. Unlike the others, Pham Quang Le had a clear purpose when studying abroad. He studied the science (19) ______ making weapons to serve the country"s independence. The meeting between him and President Ho Chi Minh in Paris in 1946 changed the life of Pham Quang Le. In 1946, under the requirements of the (20) ______, he was assigned as Head of Military Department by Uncle Ho with the (21) ______ for researching, manufacturing weapons for our soldiers to fight the enemy. Uncle Ho said, “This is the good thing, so from now on your name is Tran Dai Nghia...” A: war French B: France war C: war France D: French war 22 Combine two sentences into a new one, using the words in brackets. Do not change the given words in any way. Write the new sentences on your answer sheet. Question 22. Nick: “ I like watching films on science and technology.” (said) A: Nick said that he liked watching films on science and technology. B: Nick said that he would like watching films on science and technology. C: Nick said that he had liked watching films on science and technology. D: Nick said that he likes watching films on science and technology. 23 Combine two sentences into a new one, using the words in brackets. Do not change the given words in any way. Write the new sentences on your answer sheet. Question 23. Our life will be better because of new inventions. (make) A: New inventions will keep our life better. B: New inventions will make our life better. C: New inventions will do our life better. D: New inventions will turn our life better. 24 Choose the underlined part A, B, C or D that needs correcting. Picture 2 A: A B: B C: C D: D 25 Choose the best answer A, B, C or D to complete the sentence. Question 11: Air pollution, together with littering has _______many problems in our big cities today. A: caused B: affected C: made D: bought

giúp mk câu này nha Đề bài: replace the parts in italics with a more appropriate or accurate expression a) A:I've got an oppointment at the dentist's.Shall I leave school early? B: have you brought a note from your parents? ................................................................................................................. b)A:come on, hurry up! Tidy your room and make your bed! B: No, I don't. it's not fair! ............................................................

Hợp chất nào sau đây không tan trong nước ? A: CH3 -CH2 -COOH. B: CH3 -CH2 -OH. C: C6 H12 O6 . D: (C17 H33 COO)3 C3 H5 .