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1. The cat eats its food faster than the dog.

2. Although he plays guitar well, but he doesn't like performing in front of others

2 tháng 10 2024

1. The cat eats its food faster than the dog.

​2. Although he plays guitar well, he doesn't like performing in front of others.

2 tháng 10 2024

1 I am fond of reading stories about famous scientists

2 They spend a lot of time doing DIY projects with their parents

3 Teen stress might come from conflicts with friends or siblings

3 tháng 10 2024

1 I am fond of reading stories about famous scientists

to be fond of Ving: thích làm gì

2 They spend a lot of time doing DIY projects with their parents

spend + Ving: dành thời gian làm gì

3 Teen stress might come from conflicts with friends or sibling

28 tháng 9 2024

`M + 3x^2 - 4 + 5x = x^2 - 4x`

`M = x^2 - 4x - 3x^2 + 4 - 5x`

` M = -2x^2 - 9x + 4`

Vậy ...

28 tháng 9 2024

`a, x^3 - 5x^2 + 8x - 4`
`= x^3 - x^2 - 4x^2 + 4x + 4x - 4`
`= x^2(x-  1) - 4x(x - 1) + 4(x - 1)`
`= (x^2 - 4x + 4)(x - 1)`
`= (x-  2)^2(x - 1)`

 

28 tháng 9 2024

a: \(x^4-6x^3+11x^2-6x+1\)

\(=x^4-3x^3+x^2-3x^3+9x^2-3x+x^2-3x+1\)

\(=x^2\left(x^2-3x+1\right)-3x\left(x^2-3x+1\right)+\left(x^2-3x+1\right)\)

\(=\left(x^2-3x+1\right)^2\)

b: \(x^4-5x^3+8x^2-4x\)

\(=x\left(x^3-5x^2+8x-4\right)\)

\(=x\left(x^3-x^2-4x^2+4x+4x-4\right)\)

\(=x\left[x^2\left(x-1\right)-4x\left(x-1\right)+4\left(x-1\right)\right]\)

 

\(=x\left(x-1\right)\left(x^2-4x+4\right)=x\left(x-1\right)\left(x-2\right)^2\)

28 tháng 9 2024

 

 

a: Xét tứ giác BHCK có

M là trung điểm chung của BC và HK

=>BHCK là hình bình hành

=>BH//CK

mà BH\(\perp\)AC

nên CK\(\perp\)CA

b: ΔAFH vuông tại F

mà FI là đường trung tuyến

nên \(FI=\dfrac{AH}{2}\left(1\right)\)

ΔAEH vuông tại E

mà EI là đường trung tuyến

nên \(EI=\dfrac{AH}{2}\left(2\right)\)

Từ (1),(2) suy ra FI=EI

=>I nằm trên đường trung trực của EF(3)

Ta có: ΔBFC vuông tại F

mà FM là đường trung tuyến

nên FM=MB=MC=BC/2(4)

Ta có: ΔBEC vuông tại E

mà EM là đường trung tuyến

nên EM=MB=MC=BC/2(5)

Từ (4),(5) suy ra ME=MF

=>M nằm trên đường trung trực của EF(6)

Từ (3),(6) suy ra IM là đường trung trực của EF

BHCK là hình bình hành

=>BK//CH

mà CH\(\perp\)AB

nên BK\(\perp\)BA

=>B nằm trên đường tròn đường kính AK(7)

Ta có: CK\(\perp\)CA

=>C nằm trên đường tròn đường kính AK(8)

Từ (7),(8) suy ra A,B,K,C cùng thuộc (O)

Xét (O) có

\(\widehat{ABC}\) là góc nội tiếp chắn cung AC

\(\widehat{AKC}\) là góc nội tiếp chắn cung AC

Do đó: \(\widehat{ABC}=\widehat{AKC}\)

MB=MC=ME=MF

=>BFEC nội tiếp (M)

=>\(\widehat{AEF}=\widehat{ABC}\left(=180^0-\widehat{BFE}\right)\)

\(\widehat{AEF}+\widehat{KAC}=90^0-\widehat{AKC}+\widehat{ABC}=90^0-\widehat{ABC}+\widehat{ABC}=90^0\)

=>AK\(\perp\)EF

28 tháng 9 2024

Yêu cầu của bài toán là gì vậy em?

28 tháng 9 2024

\(\left(x^2+3x\right)^2-2\left(x^2+3x\right)-8\)

\(=\left(x^2+3x\right)^2-4\left(x^2+3x\right)+2\left(x^2+3x\right)-8\)

\(=\left(x^2+3x-4\right)\left(x^2+3x+2\right)\)

\(=\left(x+4\right)\left(x-1\right)\cdot\left(x+2\right)\left(x+1\right)\)

EXERCISE 5. Rewrite each of the following sentences in such a way that it has the same meaning as the sentence printed before it. 1. My kitchen is smaller than yours.  Your kitchen ……………………………………………………………………………… 2. No one in the class is taller than Dave.  Dave is ………………………………………………………………………  3. Mum doesn’t speak English as well as Dad.  Dad...
Đọc tiếp

EXERCISE 5. Rewrite each of the following sentences in such a way that it has the same meaning as the sentence printed before it.
1. My kitchen is smaller than yours.
 Your kitchen ………………………………………………………………………………
2. No one in the class is taller than Dave.
 Dave is ……………………………………………………………………… 
3. Mum doesn’t speak English as well as Dad.
 Dad ……………………………………………………………………………….………
4. Lan is better cook than Hoa.
 Hoa can’t  …………………………………………………………………………...……
5. No restaurant in the city is better than that one.
 That restaurant is …………………………………………………………………………
6. This watch is worse than that one.
 That watch  ………………………………………………………………………….……
7. My sister writes more carefully than she did.
 My sister  …………………………………………………………………………………
8. This story is more interesting than any other story that I have ever read.
 This is the ………………………………………………………………………………
9. She is the most beautiful girl I have ever known.
 I’ve never .............................................................................................................................
10. Peter does not drive so carefully as Tom.
 Tom ………………………………………………………………………………………

3
28 tháng 9 2024
  1. Your kitchen is bigger than mine.
  2. Dave is the tallest in the class.
  3. Dad speaks English better than Mum.
  4. Hoa can’t cook as well as Lan.
  5. That restaurant is the best in the city.
  6. That watch is better than this one.
  7. My sister writes less carefully than she did.
  8. This is the most interesting story I have ever read.
  9. I’ve never known a girl more beautiful than her.
  10. Tom drives more carefully than Peter.
30 tháng 9 2024

1. My kitchen is smaller than yours.
 Your kitchen …is bigger than mine……………………………………………………………………………
2. No one in the class is taller than Dave.
 Dave is …………the tallest student in the class…………………………………………………………… 
3. Mum doesn’t speak English as well as Dad.
 Dad ……speaks English better than Mum………………………………………………………………………….………
4. Lan is better cook than Hoa.
 Hoa can’t  ……cook as well as Lan……………………………………………………………………...……
5. No restaurant in the city is better than that one.
 That restaurant is ……………the best in the city……………………………………………………………