\(\frac{-1}{2}+\frac{3}{21}+\frac{-2}{6}+\frac{-5}{30}\)

\(\frac{-1}{2}+\frac{1}{7}+\frac{-1}{3}+\frac{-1}{6}\)

\(\frac{-21}{42}+\frac{6}{42}+\frac{-14}{42}+\frac{-7}{42}\)

\(\frac{-36}{42}=-\frac{6}{7}\)

\(\left(6-2\frac{4}{5}\right).3\frac{1}{8}-1\frac{3}{5}:\frac{1}{4}\)

\(=\left(6-\frac{14}{5}\right).\frac{25}{8}-\frac{8}{5}:\frac{1}{4}\)

\(=\frac{16}{5}.\frac{25}{8}-\frac{32}{5}\)

\(=10-\frac{32}{5}\)

\(=\frac{18}{5}\)

sorry, mik ko biết vẽ trên này thế nào

b. Ta thấy: OD là tia đối của tia OB

=> \(\widehat{BOD}\)là góc bẹt =  \(^{180^0}\)

=> \(\widehat{DOC}+\widehat{COB}=\widehat{DOB}\)

=> Góc kề bù với \(\widehat{BOC}\)là \(\widehat{DOC}\)

=> \(\widehat{DOC}=\widehat{DOB}-\widehat{COB}\)

Mà: \(\widehat{COB}=\widehat{COA}-\widehat{BOA}\)

=>\(\widehat{COB}=80^0-35^0\)

=>\(\widehat{COB}=45^0\)

Thay:\(\widehat{DOB}=180^0,\widehat{COB}=45^0\)

=> \(\widehat{DOC}=180^0-45^0\)

=>\(\widehat{DOC}=135^0\)

1. I (have) ____will have_____ a UFO in the future.

2. We (be) ___have been______ to Ha Noi many times.

3. I (not go) _______didn't go_________ to school last Sunday.

4. Yesterday my friends and I (play)_______played________ sports in the school yard.

5. Peolple might (live) ______live______ on the moon

Give the corrcet form of the verbs:

1. I (have) ___will have______ a UFO in the future.

2. We (be) ____have been_____ to Ha Noi many times.

3. I (not go) ________didn't go ________ to school last Sunday.

4. Yesterday my friends and I (play)______played_________ sports in the school yard.

5. Peolple might (live) ______live______ on the moon.

1 Robots/not only/talk/people/but/understand/what they think.

\(\Rightarrow\) Robots don't only talk to people but also understand what they think.

2. Robots/recognise/our voices/faces/they/not/ think//human.

\(\Rightarrow\) Robots can recognise our voices and faces but they don't think they human.

3.You/think/robots/build house/sea/us ?

\(\Rightarrow\) Do you think robots can build house by the sea for us?

4 i/agree/you/that/life/more comfortable/future .

\(\Rightarrow\)I agree with you that life will mỏe comfortable in the future.

5.More people/lose/job/robots/do/many kinds/jobs.

\(\Rightarrow\)More people lose job but robots can do many kinds of jobs.

sai đề ko bạn ?

Bạn lên mạnh nhấn adult pron ra ngay

1.D

2.C

3.B

4.C

5.D

6.A

7.A

8.B

1)D

2)C

3)B

4)C

5)D

6)A

7)A

8)B

mik ko bt đúng hay sai đâu!nếu sai thông cảm nhé!