Question

Bằng phương pháp nhóm hạng tử.

x²-x-y²-y

x²-2xy+y²-z²

5x-5y+ax-ay

a³-a²x-ay+xy?

Answer 1

x^2-x-y^2-y

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

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

b,=(x-y)^2-z^2

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

Các câu còn lại lm tương tự.....

Answer 2

h.trang à

Answer 3

\(x^2-x-y^2-y\)

\(=\left(x-y\right)\left(x+y\right)-\left(x+y\right)\)

\(=\left(x+y\right)\left(x-y-1\right)\)

\(x^2-2xy+y^2-z^2\)

\(=\left(x-y\right)^2-z^2\)

\(=\left(x-y-z\right)\left(x-y+z\right)\)

\(5x+5y+ax-ay\)

\(=5\left(x-y\right)+a\left(x-y\right)\)

\(=\left(x-y\right)\left(5+a\right)\)