Ex3 :VN
1.My father waters this flower every morning.
2.John invited Fiona to his birthday party last night.
3.Her mother is preparing the dinner in the kitchen.
4.We should clean our teeth twice a day.
5.Our teachers have explained the English grammar.
6.Some drunk drivers caused the accident in this city.
7.Tom will visit his parents next month.
8.The manager didn’t phone the secretary this morning.
9.Did Mary buy this beautiful dress?
10.I won’t hang these old pictures in the living room.

Bài 8: Tìm giá trị nhỏ nhất của

A=√𝑥2 −4𝑥+25 , 
C=3+√𝑥 √𝑥+1
B=√𝑥2 −6𝑥+30

D=√𝑥2 −4𝑥+7+√2

Bài 4:Vẽtam giác ABC. Vẽcác đường trung trực của đoạn thẳng AB, BC, CA.

Bài 5:Vẽđường trung trực của các đoạn thẳng:

a/ AB= 4 cm

b/ MN= 2cm

c/ CD= 5cm