Question

rút gọn biểu thức

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

Answer 1

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

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

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

Answer 2

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

=x²-xy+xy-y²

=x²-y²

Answer 3

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

=\(x^2\)-xy+yx-\(y^2\)

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

Answer 4

X(x-y) + y(x-y)

= x.x – x.(-y) + y.x + y.(-y)

= x² – xy + yx – y²

= x² – y²