8 Her telephone number isn't known by me

9 The children will be brought home by my students

10 đúng r

11 We were given more information by her

12 All the workers of the plan were being instructed by the chief engineer

Her telephone number isn't known by me

The children will be brought home by my students

A present will be sent to me last week

we were gave more information by her

all the workers of the plan were being instrcued by the chief engineer

8. Her telephone number isn't know by me.

9. The children will be brought home by my students.

10. A present was sent me last week by them.

11. We were given more information by her.

12. All the workers of the plan were being instructed by the chief engineer.

Nhỏ quá

Bài 4: 

Nhóm 1: x;1/3x; 8x

Nhóm 2: \(x^2;5x^2;-3x^2\)

Bài 3: 

a: Xét ΔABD vuông tại A và ΔEBD vuông tại E có

BD chung

\(\widehat{ABD}=\widehat{EBD}\)

Do đó: ΔABD=ΔEBD

b: Ta có: ΔABD=ΔEBD

nên DA=DE

mà DE<DC

nên DA<DC

c: Xét ΔADF vuông tại A và ΔEDC vuông tại E có 
DA=DE

\(\widehat{ADF}=\widehat{EDC}\)

Do đó: ΔADF=ΔEDC

Suy ra: AF=EC

Ta có: BA+AF=BF

BE+EC=BC

mà BA=BE

và AF=EC

nên BF=BC

hay ΔBFC cân tại B

d: Ta có: BF=BC

nên B nằm trên đường trung trực của BC(1)

Ta có: DF=DC

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

Ta có: KF=KC

nên K nằm trên đường trung trực của BC(3)

Từ (1), (2) và (3) suy ra B,D,K thẳng hàng

Then the glass is washed with a detergent liquid

bài 

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