50 kW = 50,000W

4500kJ = 4 500 000 J

Thời gian chuyển động là

\(P=\dfrac{A}{t}\Rightarrow t=\dfrac{A}{P}=\dfrac{4,500,000}{50,000}=90\left(s\right)\) 

Lực kéo đầu tàu là

\(F=\dfrac{P}{v}=\dfrac{50,000}{10}=5000\left(N\right)\)

25 What are you going to do this week?

26 We might go on holiday to the moon in the future

27 There will be a robot in my house

28 The room is very large

25.What are you going to do this week?

26.We might go on holiday to the moon in the future.

27.There will be have robot in my house.

28.The room is large

Chúc bạn học tốt✔✔

đề bài là tính thông thường thôi hả bạn

98765432x9876432-98765431x98765433

=9752655002593024-98765431x98765433

=9752655002593024-9754610558146623

=   -1955555553599

kết quả bằng 1 bạn nhé

`0,35xx16:0,28-(2,34+1,17:4,5):0,25`

`=5,6:0,28-(2,34+0,26):0,25`

`=20-2,6:0,25`

`=20-10,4=9,6`

28 I haven't gone to HCM City for 2 years

29 We have lived in My Tho for ten years

30 Lan didn't go to school last week

31 He was at home yesterday

Question8:

29. We live in Phu Tho about ten years.

30. I will see him tomorrow.

31. Lan didn't go to school last week

32. He was at home yesterday.

bạn viết rõ hơn đi

Hà Phương hả

hơi quen quen

-15+15-17+17+19-18

=0+0+19-18

=0+0+1

=1

=(15-15)+(17-17)+(19-18)

=1 nhé bạn

-15 - 17 + 19 + 15 - 18 + 17 

= ( -15 + 15 ) + ( -17 + 17 ) + ( 19 - 18 )

= 0 + 0 + 1

= 1