1Mặt phẳng nghiêng: Thềm nhà, cầu thang,…

2 Đòn bẩy :đồ khui (bia), cắt móng tay, máy bắn đá,...

3 Ròng rọc:thang máy , cáp treo, cần cẩu,...

chÚC bn may mén!!!

5/ John said he didn't understand the question.

6/Mike and Bob said their room was messy.

7/ Grandpa said he always watched the news in the evening.

8/ Ella said it was going to rain.

9. Gordon said he was making lamb chops for dinner.

10/ Melanie said she would take the dog for a walk.

11/ The teachers said school was almost over.

12. Dylan said he couldn't find his glasses.

1/Grandam said she was 70 years old.

2/ My aunt said she could play the guitar.

3/ Dad said he had to clean the garage.

4/ My friends said they were going to the cinema.

5/ John said he didn't understand the question.

6/ Mike and Bob said their room was messy.

7/ Grandpa said he always watched the news in the evening.

8/ Ella said it was going to rain.

chúc bn may mén!!!

Một cửa hàng có 3 tấm vải dài tổng cộng 108m. Sau khi bán đi \(\dfrac{1}{2}\) tấm thứ nhất, \(\dfrac{2}{3}\) tấm thứ hai và \(\dfrac{3}{4}\)

tấm thứ ba thì số vải còn lại ở 3 tấm bằng nhau. Tính chiều dài mỗi tấm vải lúc đầu?

a)Giá nhập về của tivi là:

3 454 000:(1+10%)= 3 140 000  (đồng)

b)Để lãi 15% so với giá nhập thì cửa hàng cần bán tivi với giá:

314 0000 . (1+15%)= 3611 000  (đồng)

KL:......

A = 2⁰ + 2¹ + 2² + 2³ + 2⁴ + 2⁵ … + 2⁹⁹

A=( 2⁰ + 2¹ + 2² + 2³ + 2⁴⁾ +( 2⁵ … + 2⁹⁹⁾

A= 2⁰.(2⁰ + 2¹ + 2² + 2³ + 2⁴)+2⁵.( 2⁵ … + 2⁹⁹⁾

A= 1. 31+ 2⁵.31… + 2⁹⁵.31

A= 31. (1+2⁵...+2⁹⁵)

KL: ...... 

A = 2⁰ + 2¹ + 2² + 2³ + 2⁴ + 2⁵ … + 2⁹⁹

^A=( 2⁰ + 2¹ + 2² + 2³ + 2⁴⁾ +( 2⁵ … + 2⁹⁹⁾

A= 2⁰.(2⁰ + 2¹ + 2² + 2³ + 2⁴)+2⁵.( 2⁵ … + 2⁹⁹⁾

A= 1. 31+ 2⁵.31… + 2⁹⁵.31

^A= 31. (1+2⁵...+2⁹⁵)

KL: ...... 

đây nì bn

Ta có: 

nên }

mà x>7

nên 

úc bn may mén!!!

(-25).125.4.(-8).(-17)

= ( -25.4).( -8.125).(-17)

= -100.(-1000).(-17)

= -1 700 000