1 . When I'm a child , my grandmother teachs me sing many folk songs.

2 . Local people in that village still follow the old lifestyle as thier ancestors

3 . He goes to bed late last night , therefore this morning he was feel tired

4 . Although , watching TV is not good way to relax , you shouldn't watch it too much

1 When I was a child, my grandmother taught me to sing many folk songs

2 Local people in that village still follow the old lifestyle of their ancestors

3 He went to bed late last night therefore this morning he feels tired

4 Although watching TV is a good way to relax, you shouldn't watch it too much

Lời giải:
a. Tứ giác $AMKN$ có 3 góc vuông $\widehat{A}=\widehat{M}=\widehat{N}=90^0$ nên $AMKN$ là hình chữ nhật.

b.

Xét tam giác $AEM$ và $AKM$ có:
$MA$ chung

$\widehat{AME}=\widehat{AMK}=90^0$
$EM=KM$ (do $E,K$ đối xứng nhau qua $M$)

$\Rightarrow \triangle AEM=\triangle AKM$ (c.g.c)

$\Rightarrow \widehat{EAM}=\widehat{KAM}(1)$

Tương tự:

$\triangle AKN=\triangle ADN$ (c.g.c)

$\Rightarrow \widehat{DAN}=\widehat{KAN}(2)$

Từ $(1); (2)\Rightarrow \widehat{EAM}+\widehat{MAN}+\widehat{DAN}=\widehat{KAM}+\widehat{MAN}+\widehat{KAN}=2\widehat{MAN}=2.90^0=180^0$

Hay $\widehat{EAD}=180^0$

$\Rightarrow E, A, D$ thẳng hàng.

Hình vẽ:

Từ đồng nghĩa với từ "local" có thể là:

1. Regional

2. Area

3. Community

4. Neighborhood

5. District

6. Provincial

7. Municipal

8. Indigenous

9. Domestic

10. Native

Từ đồng nghĩa với từ "local" có thể là:

1. Regional

2. Area

3. Community

4. Neighborhood

5. District

6. Provincial

7. Municipal

8. Indigenous

9. Domestic

10. Native

\(3x^2+2y^2=5xy\)

\(\Leftrightarrow3x^2+2y^2-5xy=0\)

\(\Leftrightarrow2\left(x^2-2xy+y^2\right)+x^2-xy=0\)

\(\Leftrightarrow2\left(x-y\right)^2+x\left(x-y\right)=0\)

\(\Leftrightarrow\left(x-y\right)\left[2\left(x-y\right)+x\right]=0\)

\(\Leftrightarrow\left(x-y\right)\left(3x-2y\right)=0\)

\(\Leftrightarrow3x-2y=0\Leftrightarrow x=\dfrac{2y}{3}\) Thay vào S

\(\Rightarrow S=\dfrac{y+\dfrac{4y}{3}}{y-\dfrac{4y}{3}}=-7\)

Acid gì bạn