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a. 1/1.3 + 1/3.5+1/5.7 +....+1/19.21 b. 1/99-1/99.97-1/97.95-1/95.93-....-1/5.3-1/3.1

Giúp em con d đi mn em cảm ơn trc hôm nay bắc buộc nộp nài ạ mong mn giúp em

giúp vs ạ .........................................

Câu 8: Đặt câu hỏi cho từ hoặc cụm từ gạch chân 71. She is cooking meal in the kitchen.=>…………………………………………………………………… 72. I’d like some milk and vegetables.=>…………………………………………………………………… 73. Nam is doing his homework.=>………………………………………………………………………… 74. Nam never flies a kite.=>……………………………………………………………………………… 75. We often go to school by bicycles.=>……………………………………………………………………… 76. Her eyes are brown=>……………………………………………………………………………… 77. My sister is in grade 6.=>……………………………………………………………………………… 78. Mai is tired and hungry=>……………………………………………………………………………… 79. My brother wants a glass of lemon juice.=>……………………………………………………………… 80. Linh has milk and eggs for her breakfast.=>…………………………………………………………… Giúp mik vs ạ

Tìm số nguyên x để : (x^3-x^2+2x+7) chia hết cho x^2+1

Câu 7. Điền từ thích hợp vào chỗ trống: I have a very close friend. Her name is Mai. She is eleven years old and she is in (61)........................ six. She(62)........................ speak English. She has English (63)..........................Tuesday, Thursday and Friday. She can also (64)......................... the piano. In her room,(65)............................... is a piano and some books. Every day she gets up at six. She (66).............................. breakfast at six thirty and goes to school at a (67).............................. to seven. She has her (68)................................ from seven o’clock to eleven thirty. Then she(69)............................... home and has lunch at twelve o’clock. It’s three o’clock in the afternoon now and Nga is in her room. She (70)...........................doing her homework Giúp mik với ạ

Câu 6: Đọc đoạn văn, sau đó trả lời câu hỏi : My name is Nguyen Minh Trung. I’m a new student in class 6A. I’m from Da Nang and my family still lives there. In Ho Chi Minh City, I live with my grandparents at 21/3B Nguyen Trai street. My new school is not far from our house – about one kilometer, so I go to school by bike. There are a lot of students in my new school. But I don’t have any friends. I’m unhappy. I miss my parents, my sisters and my friends in Da nang. 56. Which grade is Trung in?.............................................................................................................................. 57. Is he a new student? ..................................................................................................................................... 58. Where is he from? ........................................................................................................................................ 59. How far is it from his house to school? ........................................................................................................ 60. What's his address? .................................................................................................................................... Giúp mik nhé các bạn oiw

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Chứng minh hằng đẳng thức: 3x^2 +y^2+z^2-(x-y)^2-(y-z)^2-(z-x)^2 = (x+y+z)^2