Question

please answer the questions fast​

Answer 1

18. $(2x^{2}+3y^{2}+xy) -(x^{2} -2xy+3y^{2})$

     => $2x^{2}+3y^{2}+xy -x^{2} +2xy-3y^{2}$

     => $x^{2} +3xy$

19. (m-n)+(m+n)

     => m-n+m+n

     => 2m

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Answer 2

Answer:

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