(2x+1)^2-2(x-1)x(x+1)
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Fill in the blank with a, an or the if necessary
1. ..The.. first man to land on .the...moon said: "This is ..a.. small step for..a..man. But a giant step for mankind."
2. Take ...a...seat, I have told you..the..hundred times not to come into ..a.. room with...a..hat on.
HV
18 tháng 11 2021
1. A doctor examined the elephant.
- The elephant ……was examined by a doctor…………………………………………………..
2. They took it back to the zoo.
- It ………was taken back to the zoo……………………………………………………………
3. The club bought him 2 years ago for a fee of $20 000.
- He ………was bought by the club 2 years ago for a fee of $20 000. ……………………………………………………..
4. Stephen made this film in Hollywood last year.
- This film …was made in Hollywood by Stephen last year.……………………………………………………….
5. Irish fisherman used this kind of boat one thousand years ago.
- This kind ……of boat was used by Irish fisherman one thousand years ago. ……………………………………………
6. Redwood took the photos during his voyage.
- The photos …were taken by Redwood during his voyage.………………………………………………..
TH
18 tháng 11 2021
was examined by a doctor
it was taken by them back to the zoo.
was bought by the club 2 years ago for a fee of $20 000.
was made by stephen in Hollywood last year.
was used by Irish fisherman of boat one thousand years ago.
were taken by Redwood during his voyage.
(lm zậy chắc đúng ;-;)
\(\left(2x+1\right)^2-2\left(x-1\right)\left(x+1\right)\\ =\left(4x^2+4x+1\right)-2\left(x^2-1\right)\\ =\left(4x^2+4x+1\right)-\left(2x^2-2\right)\\ =4x^2+4x+1-2x^2+2\\ =\left(4x^2-2x^2\right)+4x+\left(2+1\right)\\ =2x^2+4x+3\)