hello bang 

xin chao moi nguoi 

nguoi ta la hoang gia bao ne

=1-1/2+1/2-1/3+1/4-1/5+.......+1/99-1/100

=1-1/100

=99/100

2 k nha bn

1, Ba is a good badminton player .

\(\rightarrow\) He plays badminton well .

2, Lan is a slow runner .

\(\rightarrow\) She runs slowly .

3, Mrs.Thanh is a quick swimmer .

\(\rightarrow\) He swims quickly .

4, Mrs.Vui is a safe cyclist .

\(\rightarrow\) She cycles safely .

5, Lan's father is a careful driver .

\(\rightarrow\) He drives carefully .

6, My mother is a good cook .

\(\rightarrow\) She cooks well .

7, My sister is a beautiful dancer .

\(\rightarrow\) She dances beautifully .

8, Nam and Ba are skillful soccer player .

\(\rightarrow\) They play soccer skillfully .

9, Mr.Tuan and Mr.Nam are careless driver .

\(\rightarrow\) They drives careless .

10, We should finish our homework first .

\(\rightarrow\) We must finish our homework first .

11, Lan must tidy the house everyday .

\(\rightarrow\) Lan has to tidy the house everyday .

12, Ba ought to cook lunch for his mother .

\(\rightarrow\) Ba has to cook lunch for his mother .

1. Ba is a good badminton player

= Ba plays badminton well.( ko có goodly nha )

5. Lan's father is a careful taxi driver

= He drives taxi carefuly

6. My mother is a good cook

= She cooks well.

7. My sister is a beautiful dancer.

= She dances beautifully

8. Nam and Ba are skillful soccer players

= They are play soccer skillfully

9. Mr. Tuan and Mr. Nam are careless driver.

= They drive car carlessly

10. We should finish our homework first.

= We must finish our homework first.

11. Lan must tidy the house everyday

= Lan has to tidy the house everyday.

12. She ought to cook lunch for his mother

= Ba has to cook lunch for his mother

Mk k chắc đúng đâu,kém phần này lắm.

5.He drives taxi is carefully .

6.She cooks is good.

7.She dance is beautifully.

8.They play soccer are skillfully.

9.They drive are carelessly.

10.We must finish our homework.

11.Lan has to tidy the house everyday.

12.Ba has to cook lunch for his mother.

Có linh cạm sai nhiều lắm.

Bạn lập tóm tắt ra cho dễ hiểu:

    4 ngày : 2648 kg

    30 ngày (1 tháng) : ? kg 

                               . Giải .

30 ngày gấp 4 ngày số lần là:

        30 : 4 = 7,5 (lần)

Số kg thức ăn nhà bác Nam sử dụng trong 1 tháng là:

       7,5 x 2648 = 19860 (kg)

Trung bình 1 tháng số kg thức ăn nhà bác Nam sử dụng là:

     19860 : 30 = 662 (kg)

              Đáp số:..

cha biet moi lop 1

ai biết :))

\(\left(x-3\right)^2=25\)

\(\Rightarrow\left(x-3\right)^2=5^2\)

\(\Rightarrow x-3=5\)

\(\Rightarrow x=8\)

(x - 3)² = 25

(x - 3)² = 5² = (-5)²

=> x - 3 thuộc {5 ; -5}

=> x thuộc {8 ; -2}

Vậy x thuộc {8 ; -2}

(x-3)²=25

x-3=5 (vì 25=5²) hoặc x-3=-5 (vì 25=(-5)²

x=8 hoặc x=-2

Số thập phân đó là :

6,64 : ( 1 + 3 + 4 ) = 0,83 

Tích đúng là :

0,83 x 134 = 111,22

111,22

chắc thế

Số thập phân :

6,64 : (1 + 3 +4) = 0,83

Tích đúng :

0,83 x 134 = 111,22

=>x^2+14x+49-x^2+3x=83

=>17x=34

=>x=2