a, \(128-3\left(x+4\right)=23\)

\(=>3\left(x+4\right)=128-23\)

\(=>3\left(x+4\right)=105\)

\(=>x+4=105:3\)

\(=>x+4=35\)

\(=>x=35-4\)

\(=>x=31\)

b, \(\left[\left(4x+28\right).3+55\right]:5=35\)

\(=>\left(4x+28\right).3+55=35.5\)

\(=>\left(4x+28\right).3+55=175\)

\(=>\left(4x+28\right).3=175-55\)

\(=>\left(4x+28\right).3=120\)

\(=>4x+28=120:3\)

\(=>4x+28=40\)

\(=>4x=40-28\)

\(=>4x=12\)

\(=>x=12:4\)

\(=>x=3\)

\(#WendyDang\)

a) \(215+43+\left(-215\right)+\left(-25\right)\)

\(=\left[215+\left(-215\right)\right]+\left[43+\left(-25\right)\right]\)

\(=0+18\)

\(=18\)

b) \(\left(-312\right)+\left(-327\right)+\left(-28\right)+27\)

\(=\left[\left(-312\right)+\left(-28\right)\right]+\left[\left(-327\right)+27\right]\)

\(=\left(-340\right)+\left(-300\right)\)

\(=-640\)

1. does -> do

2. do -> play

3. reading -> reading

4. Câu đúng

5. Câu đúng

6. speak -> climb

1. B. can

2. A. play

3. C. speak

4. B.a

5. B. touch

6. D. climb

7. D. take

8. D. What

9. A. play

\(#WendyDang\)

Mấy câu còn lại thì bạn khoanh đúng ròi. ( Mình không viết vô nhe )

1. Do tigers live

3. don't eat

4. 's calling us

5. 're making

8. usually buy

-_- kỉ niệm tràn về..