Từ các số 1,2,3,4,5,6 có thể lập được bao nhiêu số tự nhiên bé hơn 100

I.Change the following sentences of past continuous tense into passive voice. 1.Peter was riding a buffalo in the filed at 4p.m yesterday. A buffalo was 2.They were watching TV when I came. TV was.................................................................................................................. 3.Students were cleaning the school yard very quickly. School yard............................................................................................................ 4.Were you having lunch when she came? Was lunch............................................................................................................... 5. We were not helping the women when it started to rain. When it started to rained, the women...................................................................... 6. I was not teaching English when it started to rain. English wa not........................................................................................................ 7. People were not playing the cello at this time last year. The cello................................................................................................................. 8.He was not using the computer at that time. The computer was...................................................................................................... 9.Duong was doing the projects this time last year. The projects.................................................................................................................. 10. Were people eating black pudding this time ten years ago? Was...............................................................................................................................

Cho tam giác ABC đường cao AH . Chứng minh rằng BC là tiếp tuyến của đường tròn tâm A bán kính AH . Bài 3: Cho hình thang vuông ABCD 0 ( 90 ) AB  có O là trung điểm của AB và góc 090COD  . Chứng minh CD là tiếp tuyến của đường tròn đường kính AB

Tính giá trị biểu thức A=x³+3x²+3x+1 với x=19

Dùng phương pháp hệ số bất định để giải cho a,b,c là các số thực dương thỏa mãn: 13a+5b+12c=9. chứng minh rằng: $\frac{ab}{2a+b}$ + $\frac{3bc}{2b+c}$+ $\frac{6ca}{2c+a}$ $\leq$ 1

Anh chị giúp em bài này với ạ ( nhìn kĩ đề )

1.3x^2-6x+5>0 2.-x^2+2x-7<0 3.-5x^2+20x-49<0 Giúp mik với (làm theo dạng chứng minh 1 biểu thức dương hoặc âm và phân tích thành hằng đẳng thức) mik cảm ơn ạ

I.Change the following sentences of present continuous tense into passive voice. 1They are cooking eggs now.  Eggs 2.He is painting some pictures in the room.  Some pictures 3.Mr. Nam Truong is learning English in /but Son town.  English is........................................................................................................ 4 . We are trying some chocolates in the market at present.  Some chocolates............................................................................................. 5.Luan is feeding the pigs in his home.  The pigs........................................................................................................ 6. He is writing some letters in the classroom.  Some letters....................................................................................................... 7. People are reading Connan all over the country.  Connan is........................................................................................................ 8. They are providing money to the poor.  Money is........................................................................................................ 9. Harry is watering the flowers in the garden now.  The flowers........................................................................................................ 10. She is not growing rice on the farm now.  Rice is........................................................................................................

Vẽ chibi nữ đơn giản NL : Xin tên mấy phim lẻ anime cảm động xíu :>>

Before leaving the dinner table, (have to, your son) ………………………. ask for permission? Giúp mik với ạ