\(\frac{1}{x}+\frac{-y}{2}=\frac{y}{2}\)

\(\Leftrightarrow\frac{1}{x}=\frac{y}{2}-\frac{-y}{2}\)

\(\Leftrightarrow\frac{1}{x}=\frac{y}{2}+\frac{y}{2}\)

\(\Leftrightarrow\frac{1}{x}=\frac{y+y}{2}\)

\(\Leftrightarrow\frac{1}{x}=\frac{2y}{2}\)

\(\Leftrightarrow\frac{1}{x}=y\)

\(\Leftrightarrow xy=1\)

\(\Leftrightarrow x=y=1\)

\(A=1500-\left\{5^3.2^3-11.\left[7^2-5.2^3+8\left(11^2-121\right)\right]\right\}\)

\(A=1500-\left\{125.8-11.\left[49-5.8+8\left(121-121\right)\right]\right\}\)

\(A=1500-\left\{1000-11\left[49-40+8.0\right]\right\}\)

\(A=1500-\left\{1000-11.9\right\}\)

\(A=1500-\left\{1000-99\right\}\)

\(A=1500-901=599\)

\(=2.\left(\frac{3}{5.8}+\frac{11}{8.19}+...+\frac{99}{101.200}\right)\)

\(=2.\left(\frac{1}{5}-\frac{1}{200}\right)\)

\(=2.\frac{39}{200}=\frac{39}{100}\)

\(E=\frac{6}{5.8}+\frac{22}{8.19}+\frac{24}{19.31}+\frac{140}{31.101}+\frac{198}{101.200}\)

    \(=2.\left(\frac{3}{5.8}+\frac{11}{8.19}+\frac{12}{19.31}+\frac{70}{31.101}+\frac{99}{101.200}\right)\)

    \(=2\left(\frac{1}{5}-\frac{1}{8}+\frac{1}{8}-\frac{1}{19}+\frac{1}{19}-\frac{1}{31}+\frac{1}{31}-\frac{1}{101}+\frac{1}{101}-\frac{1}{200}\right)\)

    \(=2\left(\frac{1}{5}-\frac{1}{200}\right)\)

    \(=2.\frac{39}{200}\)

      \(=\frac{39}{100}\)

1. She is pracing the piano.

What is she doing?

2. I usually play soccer after school.

what do you usually do after school?

3. My father s playing tennis.

which sport does your father to play?

4. Minh goes swimming three times a week.

how often does Minh go swimming?

5. They are going to see a movie tonight.

what are they going to do tonight?

6. Nga wants to go shopping.

what does Nga want to do?

7. The children are in the library.

where are the children?

8. children should brush their teeth after school.

what should children do after school?

3.bỏ to nhé bạn

bài 3:

số học sinh giỏi lớp 6A là:45.2/9=10 học sinh

số học sinh khá lớp 6A là:45.2/5=18 học sinh

số học sinh trung bình lớp 6A là:45.40%=18 học sinh

số học sinh yếu lớp 6A là: 45-10-18-18=-1 học sinh 

có sai đè k ta?

bài 4:

3/5.7+3/7.9+3/9.11+.....+3/x(x+2)=24/35

3/2(1/5-1/7+1/7-1/9+1/9-1/11+...+1/x-1/x+2)=24/35

3/2(1/5-1/x+2)=24/35

   1/5-1/x+2=24/35:3/2

   1/5-1/x+2=16/35

        1/x+2=1/5-16/35

        1/x+2=-9/35

=)1.35=(x+2)(-9)

    35=(x+2)(-9)

!!!!!ĐỀ COÁ SAI K VẬY BẠN???

1.

a.= (-5/24+3/4+7/12): -9/4

=(-5/24+18/24+14/24) . -4/9

= 9/8 .-4/9=-1/2

b. =(3/5+83/200-3/200).8/3 .1/4

=(120/200+83/200-3/200) .2/3

=1.2/3=2/3

2.

a.  1/3(2x-5)=-2/3-3/2

  1/3(2x-5)=-13/6

    2x-5=-13/2

  2x=-3/2

   x=-3/2:2=-3/4

b. 1/3x-1/2x=3/4

   x(1/3-1/2)=3/4

   x.1/6=3/4

   x=9/2

có:A=2000^2001+1/2000^2002+1

=)2000A=2000^2002+2000/2000^2002+1=2000^2002+1+1999/2000^2002+1

             =1999/2000^2002+1

lại có:B=2000^2000+1/2000^2001+1

=)2000B=2000^2001+2000/2000^2001+1=2000^2001+1+1999/2000^2001+1

             =1999/2000^2001+1

vì 1999/2000^2002+1  <   1999/2000^2001+1

=)2000A   < 2000B hay A<B

câu b vid uống 4 ly trhif nếu mua 3 ly tặng 1 ky thì bạn uống ly miễn phí đó sẽ lời

còn câu b thì 20 phần trăm là còn 3 nghìn 1 ly nên chọn câu b

đúng mà sai

ko tin bạn cứ thử

/ea/: care, prepare, spare, square, fare, nightmare, pear.

/ia/: here, peer, relly, near, volunteer.

/ea/: care, prepare,pear , relly, square,fare, nightmare

/ia/:spear ,here,peer,near,volunteer

Nếu có gì sai sót thì bỏ qua giúp mk nha!!