user-avatar
lecongson27112005
2 năm trước
Cho 4 điểm A, B, C, D bất kì. Chứng minh: A. AB+CD=AD+CB B. AB-CD=AC-BD C. AB-AD=CB-CD
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

I spend my free time _______________ sport. 1 điểm a. Play b. to play c. Played d. playing A. G. Bell ____________________ many experiments before inventing the telephone. 1 điểm a. Arranged b. Conducted c. Demonstrated d. transmitted We should keep these dangerous things out of children’s ___________ 1 điểm a. Arm b. Place c. Hand d. reach Let’s paint our house ____________________. 1 điểm a. itself b. yourself c. Ourselves d. themselves They finally came up _________ a device which they first introduced in 1876. 1 điểm a. for b. with c. at d. from Don’t come in. Please wait_____________for a few minutes. 1 điểm a. Inside b. Outside c. Insides d. outsides This sign says no parking. You __________park here. 1 điểm a. must b. mustn’t c. should d. shouldn’t Our plane landed ________________ at 9pm last night. a. safety b. safely c. safe d. unsafe Bell and Watson ______________ demonstrated the invention at countless exhibitions. 1 điểm a. success b. succeed c. successful d. successfully The film was too boring for us to watch. 1 điểm a. The film wasn’t interesting enough for us to watch it b. The film was interesting enough for us to watch it c. The film wasn’t interesting enough for us to watch . d. The film wasn’t enough interesting for us to watch .

2018 © Loga - Không Ngừng Sáng Tạo - Bùng Cháy Đam Mê
Loga Team