Trong mạch điện có sơ đồ như hình sau. Các ampe kế có số chỉ được ghi tương ứng trên hình vẽ là I₁, I₂, I₃. Giữa các số chỉ này có mối quan hệ nào dưới đây?

A.  I 1 > I 2 > I 3

B.  I 1 < I 2 < I 3

C.  I 1 = I 2 = I 3

D.  I 1 = I 2 ≠ I 3

Theo bài ra ta có:3x=7y\(\Rightarrow\)\(\dfrac{x}{7}=\dfrac{y}{3}\)

Áp dụng dãy tỉ số bằng nhau ta có:

\(\dfrac{x}{7}=\dfrac{y}{3}=\dfrac{x-y}{7-3}=\dfrac{-16}{4}=-4\)

\(\Rightarrow\)X=(-4).7=-28

Y=(-4).3=-12

1017 ; 1035...... 9999

có : ( 9999 - 1017 ) :  18 + 1 = 500 số

vậy có 500 số lẻ có 4 chữ số chia hết cho 9

Tìm lim x → 1 x + 3 - 2 x - 1  

A. -1

B.  2 3

C.  1 4

D.  5 4

There are four people in my family : my parents , my brother and I me . My father is forty-four years old. He is a worker in Truong Hai company. He is a jovial man who always tell many funny stories to make us smile. My father likes gardening very much as well as watching Tv programs. Unlike most men , my father likes cooking and he cooks very well. My mother is at the same age as my father.My mothers is also a worker . She likes cooking and traveling travelling too, so whenever my parents have free time, we'll go some interesting places interesting to relax . It's a great time. My brother is eight years old. He studies in primary school. He is interested in computer games and sports like football . I am now in my final year at the secondary school I'm currently a student last year at secondary school and in my attempt to win a place at university , i am under a lot of study pressure .However , being the eldest child and the only daughter in my family I tried to help with the household chores such as wash the dishes , mop clean the floor and so on . All of members of in our family have very close relationships with each other . We often share our feelings, and whenever problems come up , we discuss them frankly and find solutions quickly. In conclusion after all sum , My family is important to me .I love my family very much.

1) Has

2) Visit

3) Listens

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