Làm giùm mình!
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
Câu 41: D
Câu 42: B
Câu 43: D
Câu 44: D
Câu 45: B
Câu 46: C
(1-2)+(3-4)+...+(2011-2012).........(có (2012-1+1):2=1006 cặp số)
=-1+-1+-1+.......+-1
=-1.1006=-1006
tick nha
24B
25A
26D
27A
28C
29,C
30D
31,healthier
32,pollute
33,protection
34,pollution
35,collect
36,pollution
37,serious
38,exhaust
39,
40,factories
41,percentage
42,scientists
43require
24B quick=>quickly
25A won't eat=>don't eat
26Dcarefully=>carelessly
27ABecause of=>because
28C beautiful=>beautifully
29,C garbages=>garbage
30Dunpolluting
bài giải :
a, nếu mỗi toa xe chở 20 tấn hàng thì ta cần số toa xe là: 180: 20 = 9 (toa )
b, nếu mỗi toa chở 30 tấn hàng thì cần số toa xe là : 180 :30 = 6 (toa )
đáp số : a: 9 toa
b, 6 toa
đúng không ???
Bài 4:
Điện trở tương đương :
\(R_{tđ}=\dfrac{U}{V}=\dfrac{12}{0,4}=30\left(\Omega\right)\)
Ta có: \(R_{tđ}=R_1+R_2\Leftrightarrow R_1=R_{tđ}-R_2=30-20=10\left(\Omega\right)\)
1 disappointed
2 effective
3 plumber
4 household
5 installation
6 conserve
7 appliances
1. I usually stayed up late to watch football matches last year.
=> I used to stay up late to watch football matches last year.
2. There were some trees in the field.
=> There used to be some trees in the field.
3. She doesn't live with her parents anymore
=> She used to live with her parents more than now.
4. He is not a poor man anymore.
=> He used to be a rich man.
5. They didn't often go to the cinema every Sunday last year.
=> They didn't use to go to the cinama every Sunday last year.
6. My hair now is much longer than that in the past.
=> In the past my hair used to be shorter.
7. I don't have time to collect stamps as when I was in primary school.
=> I used to have much time to collect stamps when I was in primary school.