9x-2.3²=3⁴

<=>9x-18=81

<=>9x=81+18

<=>9x=99

<=>x=99:9

<=>x=11

Vậy x=11

-How often

-What

1 Cho ABCD là hình thang có AB//CD biết:A-D=15° và B=3C. Tính các góc của tứ giác

Where

Who

1 Cho ABCD là hình thang có AB//CD biết:A-D=15° và B=3C. Tính các góc của tứ giác 2. Cho MNPQ là hình thang có PQ//MN biết M+N=130° và N=4P Giúp emm vs ạk:33

Giúp mik với....

1. I (see) her last year. 2. Tom (see) him before. 3. What you (do) yesterday? 4. He (write) a book since last year. 5. You (understand) now? 6. Bill (have) breakfast when I (visit) him yesterday morning. 7. The light (go) out while we (have) dinner. 8. They (go) home after they (finish) their work yesterday. 9. When we came to the stadium, the match (already begin). 10. He (sit) in a restaurant when I (see) him. 11. Before she watched TV, she (do) her homework. 12. The teacher hopes we (pass) our exam. 13. I hope the weather (be) fine tonight. 14. Yesterday, John (go) to the bookshop before he (go) home. 15. He seldom (eat) before 6 a.m. 16. What he (do) when he (be) young? 17. She (win) the gold medal in 1996. 18. I think he (not come) here. 19. I promise I (not tell) anyone about your story. 20. I suppose they (build) a new supermarket in Ha noi Giúp em vs:33

1. He ________ (ride) his bicycle when the cat ran across the road. 2. It was a lovely day. The sun was shining and the birds ________ (sing) in the trees. 3. The tourist lost his camera while he _____ (walk) around the city. 4. The lorry _____ (go) very fast when it hit our car. 5. I _______ (walk) down the street when it began to rain. 6. At this time last year, I _______ (attend) an English course. 7. Jim ________ (stand) under the tree when he heard an explosion. 8. While I _____ (study) in my room, my roommates ________ (have) a party in the other room. 9. Mary and I _________ (dance) the house when the telephone rang. 10. Kathy ____ (want) to go to Queensland for a long time. 11. They ____ (lose) their keys. 12. Jack ____ (be) to England. 13. I ____ (be) to Radio City. 14. We ____ (know) her since she arrived in our city. 15. ……..they (pay)…….. money for your mother yet? 16. Someone (take)………………. my bicycle. 17. ………you ever (eat)………….. Sushi? 18. She (not/come)…………… here for a long time. 19. I (work)………….. here for three years. 20. ………… you ever …………..(be) in New York? Giúp mik vs mik đag gấp ạ Cảm ơn trc ạ:3