1/3.5+1/5.7+...+1/(2x+1)(2x+3)=15/93

Bài 1: Hoàn thành các câu dưới đây bằng cách chia đúng các động từ trong ngoặc 1/ I (buy) ……………..……..this red car in the next year. 2/ I often (have) ………………..……..breakfast at 7.30 o’clock 3/ Her brother(not / like) ……………..………………Orange Juice 4/ My father (drive)………………………..to work daily 5/ My dog (can swim)…………………..…………...very good 6/ Lan (forget)…………………….…story at Phong’s home 7/ I (do)………………………... it for you in the next day 8/ If it is sunny, she (go) ……………………………the park 9/ I think she (come)…………………….………back late in this evening 10/ My mother (call)…………………..……..you in the 5 minutes. Bài 2: Viết lại các câu dưới đây: 1/ I / my / homework / finished / last night /. ……………………………………………………………………… 2/ help/ you / please/ me/ take / a photo. …………………………………………………………………………. 3/ She / had / fun / yesterday. …………………………………………………………………………. 4/ If/ she / exam / her/ mother / passes/ give / her / cake / will/ the/ a/ . ……………………………………………………………………………. 5/ you/ hungry / because/ I/ bring / a / cake/ are. ……………………………………………………………………………

Cho hình thang cân ABCD ( AB // CD) AH và BK là đường cao. Chừng minh AH=AK . Giả sử AB = 4cm , CD = 6cm . tính DH

1. Tim________________ the teacher his sadness. (not tell) 2. I hope I __________ the train to Manchester. (not miss) 3.__________________ she __________ her hair yellow? (dye) 4. He_________________ breakfast tomorrow morning. (not prepare) 5. The manager__________ trees in front of the office building.(not plant) 6. __________Melis __________ a beautiful long dress at her party? (wear) 7. My friends______ in the city. (not live) 8. We_________________ about the bad weather. (not worry) 9._____ you__________ in this lake with some of my friends. (swim) 10. You __________progress if you are lazy. (not make) h. Em hãy cho dạng đúng của các động từ trong ngoặc: 1. We (be) tired and we’d like (sit) down. ________________________________________________ 2. What your sister (want)? – She (want) a cold drink. ________________________________________________ 3. I (not be) hungry. ________________________________________________ 4. There (be) any bananas? ________________________________________________________ 5.He (eat) breakfast now. ________________________________________________ 6. They (play) soccer at the moment. ________________________________________________ 7. Where your sister (go) in her free time? She usually (go) to the zoo. ________________________________________________ 8. There (not be) any water in the bottle. ________________________________________________ 9. We often (do) aerobics, but at present we (play) soccer. ________________________________________________ 10. Tomorrow is Sunday. I (visit) Ngoc Son Temple. ________________________________________________

Rút gọn các biểu thức: a) 8a-6a-7a b) 6b^2-4b^2+3b^2 c) 6ab-3ab-2ab

so sánh a,20192019/20202020 và -2019/-2020 b,3/5 và 7/10 c,5/-14 và -7/16 d.20120/2021 và 2019/2020

Sắp xếp lại câu: subject/at?/you/What/good/are

Bài 1: Tính 4/9.13+11/13.24+7/8.45 Bài 2: tìm x a) 7/(x+3)(x+10)+11/(x+10)(x+21)+13/(x+2)(x+34)= x/(x+3)(x+34) b) x/2008-1/10-1/15-1/21-....-1/120= 5/8

Toán 9 rút gọn nhanh nha cần gấp

Mng giúp mình câu a vs ạ!Thanks