Cho hình thoi ABCD có 2 đường chéo cắt nhau tại O cho biết khoảng cách từ O đến mỗi cạnh hình thoi là h. AC = m; BD = n. Chứng Minh Rằng: $\dfrac{1}{$m^{2}$ }$ + $\dfrac{1}{$n^{2}$ }$ = $\dfrac{1}{$Ah^{2}$ }$

vẽ anime hơi buồn chút nhé hoặc cali : homnaythaymetmoi

1: I don’t know who wrote the song, but I’ll try and find about. A. who B. wrote C. try D. about 2: It was late, so we decided taking a taxi home. A. It B. so C. taking D. home. 3: The children were frightening by the thunder and lighting. A. The B. frightening C. the thunder D. lighting Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer 4. When Jack ___________me, I __________a letter. A. phoned - has been writing B. has phoned - was writing C. phoned- was writing D. was phoning - wrote 5. If our sources of energy ends, our life __________. A. will destroy B. destroys C. be destroyed D. will be destroyed 6. We’d like to _______ you on your winning the prize in the beauty contest last week. A. thank B. welcome C. congratulate D. invite 7. It is _______ to fail a job interview, but try again. A. disappoint B. disappointing C. disappointedly D. disappointment 8. The calculations are _______difficult that they cannot be done without a computer. A. too B. more C. so D. such 9. After _________dinner, I often watch TV. A. ate B. eat C. eaten D. eating 10. Mike won’t go to Bat Trang village tomorrow with us, _________? A. will Mike B. will he C. does Mike D. does he 11. Martin asked me _______. A. how is my father B. how my father is C. how was my father D. how my father was 12: Mr. Smiths has someone _____________his car every Sunday. A. wash B. to wash C. washing D. washed CÁC BẠN LÀM VÀ GIẢI THÍCH CHI TIẾT GIÚP MÌNH VS Ạ

Mn ơi giúp mik vs ạ mik cảm ơn mn nhiều

tìm các số a,b biết a+b=a.b=a:b

làm nhanh hộ em đc khum ạ Hứa vote nhaa

Vẽ hình thang cân EFPQ và chỉ ra các cạnh bằng nhau . Các góc bằng nhau

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Mình đang cần gấp bài này Làm ơn giúp mình với

Giúp mình câu H với ạ, mình cần gấp thanks