không làm mà đòi có ăn thì ăn chubin nhé

Bạn tham khảo code C++ nhé

Bài 5:

A 1 2 3 4 B 1 C 1 D 1

Ta có : \(\widehat{A_1}+\widehat{A_3}=180^o\) (kề bù)

            \(100^o+\widehat{A_3}=180^o\)

            \(\widehat{A_3}=80^o\)

Ta có: \(\widehat{A_3}=\widehat{B_1}=80^o\)

            \(\widehat{A_3}\) và \(\widehat{B_1}\) ở vị trí đồng vị 

\(\Rightarrow AC//BD\)

\(\Rightarrow\widehat{C}_1=\widehat{D_1}=135^o\) (đồng vị)

\(x=135^o\)

b)

G H B K 1 1 1 1

Ta có: \(\widehat{G_1}+\widehat{B_1}=180^o\left(120^o+60^o=180^o\right)\)

               \(\widehat{G_1}\) và \(\widehat{B_1}\) ở vị trí trong cùng phía

\(\Rightarrow QH//BK\)

\(\Rightarrow\widehat{H_1}=\widehat{K_1}=90^o\)(so le)

\(x=90^o\)

\(\text{Δ}=\left(-3\right)^2-4\cdot\left(2m+1\right)\)

=9-8m-4=-8m+5

Để phương trình có nghiệm kép thì -8m+5=0

hay m=5/8

Pt trở thành \(x^2-3x+\dfrac{9}{4}=0\)

hay x=3/2

1: 

a: Xét ΔBCD vuông tại B và ΔKCD vuông tại K có

CD chung

\(\widehat{BCD}=\widehat{KCD}\)

Do đó: ΔBCD=ΔKCD

Suy ra: BC=KC

=>ΔBKC cân tại C

mà \(\widehat{BCK}=60^0\)

nên ΔBKC đều

b: Ta có: BC=KC

nên C nằm trên đường trung trực của BK(1)

Ta có: DB=DK

nên D nằm trên đường trung trực của BK(2)

Từ (1) và (2) suy ra DC là đường trung trực của BK

2 on the right

3 in the world

4 on the way to work

5 in the west coast

6 on the front row

7 on the back of the class

8 on the back of this card

2. in the right

3. in the world

4. in the world

5.  on the way to work

5. on the west coast

6. in the front row

7. at the back of the class

8.on the back of this card

1 Graduates are finding it more and more difficult to find employment.

2 Creativity is more important than technical skill.

3 You don't have to be a pessimist to realize that we're in trouble.

4 Modern technology, perhaps, causes more problems than it solves.

5 It would be more economical to buy the bigger size.

Rewrite

1 Britain imports many cars, most of which are made in Japan.

2 The prisoner is said to have brought dangerous drugs into the country.

3 He apologised to Alice for not phoning her earlier.

4 Despite working very hard, Nam didn't pass the exam.

5 Had everyone arrived on time, these problems wouldn't have occurred.