chứng minh rằng 5a+2b chia hết cho 17 khi và chỉ khi 9a+7b chia hết cho 17

giúp mik 2 câu này với 1. Diwali/ of/ festival/ five-day/ celebrated/ across/ lighs/ is/ the/ by/ millions/ Hindu/ the/ world/ of. 2. house/ celebrate/ are/ candles/ decorated/ with/ to/ colourful/ Diwali/ and/ light.

Cuộc khởi nghĩa của nhân dân Campuchia chống hực dân Pháp rong những năm 1863 – 1866 do ai lãnh đạo?

Giúp mình bài về Nhiễm sắc thể này với. Mình đang cần gấp. Cảm ơn rất nhìu

Câu này có sai không ạ? Nếu có sai thì sai ở đâu ạ? Everyone in my class found the lesson very bored

Cho tam giác ABC cân tại A, AB>BC, H là trung điểm của BC. a) C/m tam giác ABH=tam giác ACH. Từ đó suy ra AH vuông góc với BC b) Tính độ dài AH nếu BC = 4cm, AB= 6cm ( làm giúp mk nhé! Hứa sẽ vote) PLease

TÍNH. {[14:(-2)]+7}:2012 TÌM X BIẾT 3x-5=-7-13 |x|-10=-3

Anh chị nào giúp em giải 1hoặc 2 bài đi

III. Rewrite sentences by combining two sentences into one sentence and using suggested clues: 1. The air is so dirty. I sneeze so much. CONDITIONAL SENTENCE TYPE 2 ________________________________________________________________________________ 2. Their children have birth defects. The parents were exposed to radiation. BECAUSE ________________________________________________________________________________ 3. The air pollution causes breathing problems. LEADS IV. Choose the answer. 1-Lan is……..beautiful……..clever. a-so / that b-enough / to c-both / and 2-What do you intend………..? a-to buy b-bought c-buying 3-My grandfather stopped………..cigarette. a-to smoke b-smoked c-smoking 4-Tim is old enough……….with machines. a-work b-working c-to work 5-I wish I…………play football like Ronaldo. a-can b-could c-am able to 6-How many people took part……….the contest. a-at b-in c-on 7-The village…………….noisy. a-is become b-is becoming c-are becoming 8-She told me……..these books to her house. a-to take b-take c-taking 9-Mary is looking………her school bag. a-for b-of c-with 10-Susan has worked for that company………..4 years. a-Since b-during c-for V. Write the correct of each verb in the brackets to complete the following sentences. 1. We all adored (1.do)_____ aerobics when we were young. 2. 30 years ago, we (2.not have)________ mobile phone. 3. The girl (3.cry)_____ when a fairy (4.appear)______. VI. Rewrite or combine the sentences, using the suggested words. 1.Vinh really loves to hang out with his friends. => Vinh really enjoys……………………………………………………………… 2. Playing beach games is very interesting. => It is…………………………………………………………………………… 3. Most ethnic peoples in Vietnam speak their own languagues( Make question) =>…………………………………………………………. 4. The girl worked hard. Her step mother wasn’t happy ( use Although) =>………………………………………………………………..…..