Bài 1: Tính giá trị của đa thức sau, biết : x+y-2=0

a. B= x^4+ 2x ³y-2x ³+x ²y ²-2x ²y -x(x+y)+2x+3

b.C = x ³+x ²y-2x ²-xy+y ²-3y-x+5

c. D= 2x^4+3x ²y2+y^4+y ², biết: x ²+y ²=1

Exercise 2: Divide the words into two column

      release                  borrow                   agree                    people                     ruler

       defeat                  pleasure                  attack                     rapid                   demand

      suggest                  believe                   leaver                   destroy                   money

      ancient                    alive                     person                   system                 machine

      species                  creamy                   across                  prepare                   pirate

        deny                     police                  surround                  invent                   confide

        canal                     paper                  sentence                 possess                    river

      happen                  appoint                   retire                   purpose                 damage

Exercise 1: Choose the word which has the different part of syllable stress position.

      1.   A. cannon                    B. chaos                       C. culture                    D. direct

      2.   A. Easter                      B. festive                     C. rename                   D. harvest

      3.   A. highlight                  B. enjoy                       C. reverse                    D. review

      4.   A. invest                      B. major                      C. perform                  D. machine

      5.   A. leather                    B. account                   C. adapt                       D. decide

      6.   A. answer                    B. believe                    C. rely                          D. decrease

      7.   A. police                      B. result                       C. correct                    D. traffic

      8.   A. funny                       B. pretty                      C. lucky                        D. alone

      9.   A. breakfast                 B. pepper                    C. hotel                        D. ticket

      10. A. parade                    B. copy                        C. replace                    D. arrive

1) tinh cacs gocs cuar △ ABC ,bieets

a) 3A=4B vaf A-B=20ddooj

b) B-C=10ddooj va C-A=10ddooj