BT2.

a)Tìm số tự nhiên có 3 chữ số,biết rằng khi chia số đó trong các số 25;28;35 thì được các số dư lần lượt là 5;8;15.

b)Tìm các giá trị nguyên của n để phân số A=\(\frac{3n+2}{n-1}\) có giá trị là số nguyên.

c)Chứng minh rằng:\(\frac{1}{4}+\frac{1}{16}+\frac{1}{36}+\frac{1}{64}+\frac{1}{100}+\frac{1}{144}+\frac{1}{196}+......+\frac{1}{10000< \frac{1}{2}}\)

BT1.Tìm x

a)\(64^x\)+\(4^{3x+2}\)=17.64

b)123-2|2x-3|=41

Read and complete.Use the worlds in the box.

Her often from favorite French likes

I have two friends.They are Mary and Paul.

Mary is...........England.She is English.Paul is from France.He is............They

are both eleven.

Mary...........studying mathematics.She often listening to music in .............free time.

Paul likes studying English .He does not like listening to music.He ...............plays

spost in his free time.His.............spost is football.

\(\frac{216}{X}\)m= 24 m

X = 216 : 24 = 54 m

Put a word in each gap in the following postcard

Judy 20 Hi Nick

Hue is great city .The (1) .................fine .It's sunny all time. The food is cheap and (2)...........

The (3)............her are friendly and hospitable.The hotel where we're staying is

small (4)...........comfortable .Yesterday we visted the historic moments.Tomorrow

we are...(5)..........on a trip along the Huong river.

You must visit city someday .you'll love it .Bye for now!.Cheers,Mi

Tìm các cặp số nguyên x,y thỏa mãn.

1.(x-2)(5y+1)=12

2.x(y+2)+y=1

Tính tổng tất cả các số nguyên thỏa mãn:

1.-4<x<3

2./x/<=4