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Nguyễn Du nhé ><

#Học_tốt

Help me ! Mình sắp phải nộp rồi .

de co sai khong ban? Mk nghi phai la 1/2+1/3+1/4+...+1/63 > 2 chu?

1. Why do people attend the festival?

2. Why do a lot of people go to Da Lat city?

3. How did they celebrate it?

1. People attend the festival for fun.

(?) Why do people attend the festival?

2. A lot of people go to Da Lat city to attend the flower festival.

(?) Why do people go to Da Lat city?

3. People celebrate it with street fairs and live music.

(?) How do people celebrate it?

___Học_tốt___

#lyt

Ta có:

\(f\left(5\right)=125a+25b+5c+d\)

\(f\left(4\right)=64a+16b+4c+d\)

\(f\left(7\right)=343a+49b+7c+d\)

\(f\left(2\right)=8a+4b+2c+d\)

Xét:

\(f\left(5\right)-f\left(4\right)=125a+25b+5c+d-64a-16b-4c-d\)

\(=61a+9b+c=2019\)

Khi đó:

\(f\left(7\right)-f\left(2\right)=343a+49b+7c+d-8a-4b-2c-d\)

\(=335a+45b+5c=5\left(61a+9b+c\right)+30=5\cdot2019+30⋮5\)

Vậy ta có đpcm

phải là 30a chứ bạn

AN = 3/4. AC → NC = 1/4.AC. Từ B hạ BH vuông góc AC
Nối BN ta có S∆BNC = 1/2 .NC.BH = 1/2. 1/4.AC.BH
1/4. 1/2 .AC.BH = 1/4.S∆ABC → S∆BNA = 3/4.S∆ABC
từ N hạ NK vuông góc AB ta có AM = 2/3 AB→ MB = 1/3.AB
S∆BNM = 1/2 .NK.BM= 1/2 .NK.1/3AB = 1/3. S∆BNA
→ S∆BNM = 1/3 . 3/4.S∆ABC = 1/4 S∆ABC
Diện tích tứ giác BMNC = S → S = S∆BNC+S∆BNM =120 cm²
→1/4.S∆ABC + 1/4.S∆ABC = 1/2.S∆ABC = 120 cm²
→ S∆ABC = 240 cm²

                                 Bài giải

 Diện tích hình thang ABCD là 

     (20+40)x32:2=960(m2)

  Phần còn lại bạn tự làm nha!

(1) C

(2) D

(3) A

(4) E

(5) B

COMPLETE THE DIALOGUE WITH THE WORDS / PHRASES IN THE BOX .

         A. Why     B.What would you to do          C.  What would you  

                   D. Who would you                   E . Where would you  

A: ( 1 ) C. What would you to be in the future ?

B: I'd to be a teacher or English .

A:( 2 ) D. Who would you to teach ?

B: Young children .

A: ( 3 ) A. Why ?

B: because I'd to teach them how to speak English .

A: ( 4 ) E.Where would you  to work ?

B: In a primary school in the mountainns .

A: ( 5 ) B. What would you to do in your free time ?

B : I'd to care for poor children .

Phân số chỉ số gạo còn lại ở kho 1 là

1-2/9=7/9 số gạo kho 1

Khi đó, số gạo kho 1 là

150:2=75 tấn

Số gạo kho 1 lúc đầu có là

75:7/9=

Từ đó tìm ra số gạo kho 2

Bài làm:

Ta có:\(\frac{3\sqrt{10}+\sqrt{20}-3\sqrt{6}-\sqrt{12}}{\sqrt{5}-\sqrt{3}}\)

\(=\frac{3\sqrt{10}+2\sqrt{5}-3\sqrt{6}-2\sqrt{3}}{\sqrt{5}-\sqrt{3}}\)

\(=\frac{3\sqrt{2}.\left(\sqrt{5}-\sqrt{3}\right)+2.\left(\sqrt{5}-\sqrt{3}\right)}{\sqrt{5}-\sqrt{3}}\)

\(=\frac{\left(3\sqrt{2}+2\right).\left(\sqrt{5}-\sqrt{3}\right)}{\sqrt{5}-\sqrt{3}}\)

\(=3\sqrt{2}+2\)

Học tốt 

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