I : Tìm giá trị lớn nhất của biểu thức

a) A=5x-x^2 b) B=x-x^2 c) C= 4x-x^2+3

d) D=-x^2+6x-11 e) E=5-8x-x^2 f) F=4x-x^2+1

I : Match each half a sentence in column A with its suitable half in column B

A B

1: The weather is not warm enough a) To go to school

2: He is not old enough b) To take part in those activities

3: The train was not good enough c) for him to get the scholarship

4: Tom's grade was not good enough d) to realize the trick

5: Mr.Hung is not qualified enough e) To lift the weights

6: He is not clever enough f) To be accepted to the company

7: She is old enough g) For me to go swimming

8: Tom is strong enough h) For him to arrive on time

help me

I : Make sentences with " enough " to describe the following situations

1: The car is 150,000USD and he has only 60 , 000 USD

He is...................

The car..........................

2 : The bookshelf is 1,2 meter high and the child is only 1 meter tall

He is .........

The bookself .......................

3: Trung is 6 years old now . He wants to go to school

Trung is ...............

4: The car has 4 seats , but there are 7 people

The car doesn't has ..............

The cả isn't big ...................

5: She can not wear the dress any more because she has gained 5 kilos

The dress is not ................

help me

I : Tìm x , y

a) x^2+y^2-2x+4y+5=0

b) 4x^2+y^2-4x-6x+10=0

c) 5x^2-4xy+y^2-4x+4=0

d)2x^2-4xy+4y^2-10x+25=0

help me

I : Cho hình thang ABCD , AB//CD , Vẽ các phân giác trong tại A và D cắt nhau tại I , tại B và C cắt nhau tại K

a) Tính góc AID và góc DKC

b) C/m : MI//CD ( MN là TĐ của AD và BC )

c) C/m : MIKN thẳng hàng

help me

I : Cho tứ giác ABCD , M N là trung điểm của AD và BC , I là trung điểm của AC

a) C/m : MI//CD

b) Biết MN=AB+CD/2 . C/m ABCD là hình thang