Đáp án+Giải thích các bước giải:
`41.`
Hình chữ nhật không thể có 2 đường chéo vuông góc với nhau.
`->C`
`42.`
Hình thang cân là hình chữ nhật khi có 1 góc vuông.
`-> D`
`43.`
Tứ giác không là hình chữ nhật được khi 4 cạnh bằng nhau.
`->D`
Bài `41;`
`C)2` đường góc vuông góc với nhau là sai vì chúng chỉ cắt nhau tại trung điểm chứ không vuông góc với nhau
Bài `42:`
`D)\hat{BCD}=90^o`
`->`Vì hình thang cân có `1` góc vuông thì nó là hình chữ nhật
Bài `43:`
`C` là sai vì nếu `4` cạnh `=` nhau thì nó là hình vuông chứ không phải hình chữ nhật
help plllllllllllllllllsssssssssss
Mn ơi em cảm ơn rất nhìu Em cần gấp lắm ạ
bày cho mình cách calli bằng app medibang(bày từng chi tiết mình sẽ cho ctlhn+5sao+cảm ơn
chia động từ 1.Lan said that she (be) happy that day 2.my mother said that i( have to/) .. do the work myself that night 3.they say that they(see) .... then 4.he said he (not go).. the week before nhớ giải thích
Làm và giải thích giúp e vs ạ. Vote 5*
Lam tinh chia: ( 3x^4 + x^3 + 6x -5) cho x^2 +1
Cho a, b, c là các số đôi một khác nhau, khác 0. Biết ab là số tố nguyên và ab/bc=b/ . Tìm abc
Mọi người giúp em bài này với ạ
Tìm x để P=(x^2-4x+2):(x+1) nguyên
PRACTICE TEST 03 A. READING & WRITING I. Choose the correct answer A, B, c or D to fill each blank in the following passage. Coin collecting is one of the most popular hobbies in the world. Most coin (1) enjoy trying to have a complete set of a country’s coins. Some people collect coins for pleasure; (2) collect coins in order to sell them later. From coins, we can also (3) something about certain famous people and events in a country’s (4)______. Many beginning collector go to the bank and buy coins. Then they (5) coins for their collection. 1. A. collectors B. collecting C. collected D. collections 2. A. another B. other C. others D. the other 3. A. teach B. learn C. give D. offer 4. A. history B. nature C. science D. geography 5. A. look B. see C. watch D. find II. Read the article and then decide whether the statements are true (T) or false (F). After school Susan goes home to do her model-making. She loves making models. She started about a year ago. She needs about two weeks to make a model. Then she puts it on the shelf in her bedroom. She has about twenty models now. She thinks she will need to get another shelf soon. Last term she tried to start a club for model-making at school but the teachers and other children weren’t interested. She thinks she has a lot of fun anyway. True False 1. Susan makes models when she stays at school. □ □ 2. She has made her models for about one year. □ □ 3. It takes her two weeks to make two models. □ □ 4. She will need another shelf for her models soon. □ □ 5. Susan tried to start a club for model making and the teachers and other □ □ children were interested in it very much. III. Read the passage, and then choose the best answer. Along with jogging and swimming, cycling is the best all-round forms of exercise. It can help to increase your strength and energy, giving you a stronger heart. You don’t carry the weight of your body on your feet when cycling. It is also a good form for people with a pain in your feet or your back. You should start your hobby slowly. Doing too quickly can have bad effects. You should cycle twice or three times a week. If you find you are in pain, you will stop and take a rest. 1. Why is cycling a good form of exercise? 2. Why might people with a pain in the back go cycling? 3. What will happen if you do too quickly? 4. How often should you go cycling? 5. What will you do if you find you are in pain? E. WRITING I. Use the words or phrases given to write meaningful sentences. 1. Name of the hobby: I/ unusual hobby/ collect/ buttons. => 2. When I started the hobby: When/ I/ ten/ I/ lose/ a cute button/ shirt. I/ have to/ find/ another/ to replace. => 3. Why I like it: Buttons/ long history. Buttons/ be made/ different materials. They/ various sizes/ shapes/ designs/ colours. => 4. Feelings about the hobby: Button collecting/ not expensive/ it/ useful/ many ways => 5. Future: I/ collect/ rare buttons/ other countries. =>
Loga.vn - Cộng Đồng Luyện Thi Trực Tuyến