Question

Helllllp mai mới nộp r, mn ghi rõ lời giải ra dùm mới nhé

Answer 1

9: =(x+3)^2-y^2=(x+3+y)(x+3-y)

10: =z(x+y)-2(x+y)=(x+y)(z-2)

11: =(2x+1)^2-(3y)^2

=(2x+1+3y)(2x+1-3y)

12: =(x-y)^2+4(x-y)

=(x-y)(x-y+4)

13; =(x-3y)^2-25z^2

=(x-3y-5z)(x-3y+5z)