mn giúp em với e cần gấp
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![](https://rs.olm.vn/images/avt/0.png?1311)
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a: Xét ΔBAC có
D là trung điểm của AB
M là trung điểm của AC
Do đó: DM là đường trung bình của ΔABC
Suy ra: DM//BC và \(DM=\dfrac{BC}{2}=3.5\left(cm\right)\)
![](https://rs.olm.vn/images/avt/0.png?1311)
1.she spends 20 minutes to draw a picture
2.Lan is the most creative in the group
3.No one is smaller than him
4.My pen isn't the same than mine
5.Lan is jealous than her
6.My brother no longer raise pets
-chúc bạn thật thông minh!!!!
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
1.Yes, they do
2..Yes, it is
3.People buy fruits and flowers from the market and decorate their house
4.People visit their family and friends
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![](https://rs.olm.vn/images/avt/0.png?1311)
1, That
2, This
3, that
4, those
5, these - that
6, these
7, this
8, that
9, that
10, this
11, those
12, this
13, it
14, these
15, them
16, those
![](https://rs.olm.vn/images/avt/0.png?1311)
a: ΔMNP có
NE là tia phân giác
nên \(\dfrac{ME}{EP}=\dfrac{MN}{NP}\left(1\right)\)
Xét ΔMPN có PF là tia phân giác
nên \(\dfrac{MF}{FN}=\dfrac{MP}{PN}=\dfrac{MN}{NP}\left(2\right)\)
Từ (1) và (2) suy ra ME/EP=MF/FN
hay FE//NP
![](https://rs.olm.vn/images/avt/0.png?1311)
4 in the factory works as carefully as Mr Tam
5 I were you, I would give up smoking
6 met him for ages
7 that she improve her English
8 to him for being late
9 repairing
10 only 5 minutes brushing teeth every morning
4. Nobody in the factory is more careful than Mr Tam
5. If only you gave up smoking.
6. We haven't met him for ages.
7. I suggest that she should improve her English
8. I apologized to him for being late
9. The room needs to be more new to be used
10. We spend 5 minutes brushing our teeth every morning
Test 2
1. It took me 3 weeks to write this book
![](https://rs.olm.vn/images/avt/0.png?1311)
my - your
my
I - my
her
Nam and Lan's teacher
is
Her
Those students' school bags
your
He
is - your - She
its
her
His
their
hers
him
her
đưa mình zalo bạn nhé
Bạn tự vẽ hình nhé :
a, Theo định lí Pytago ta có :
\(AC^2=BC^2-AB^2=13^2-12^2=25\)
\(\Rightarrow AC=5cm\)
b, Do \(AC< AB\Rightarrow\widehat{B}< \widehat{C}\)
c, \(ED//AB \)
= > \(\widehat{DEA}=90^0\)
và \(\widehat{EDA}+\widehat{EAD}=90^0\)
mà \(\widehat{EAD}=\widehat{HAC}\)( đối đỉnh )
\(\Rightarrow\widehat{BCA}=\widehat{EDA}\)
Xét \(\Delta ABC\)và \(\Delta EAD\)có :
\(\widehat{DEA}=\widehat{BAC}=90^0\)
\(\widehat{EDA}=\widehat{BCA}\)
\(DA=BC\)
= > \(\Delta ABC=\Delta EAD\left(ch-gn\right)\)
d, Giả sử \(\widehat{ IAH}=90^0\)
Ta có : \(AH\perp BC\)và \(AI\perp BE\)
= > A nằm trên đường phân giác của \(\widehat{HBI}\)
Mà tứ giác \(IACD\)có \(\widehat{I}=\widehat{H}=\widehat{A}=90^0\)
= > \(\widehat{IBH}=90^0\)
\(\Rightarrow\widehat{ABC}=45^0\)
\(\Rightarrow\Delta ABC\)vuông cân
= >