Question

phan tich da thuc thanh nhan tu

a) xy-y²+2x-2y

b) x²+2xy+y²-9

Answer 1

a, = (xy-y^2) + (2x-2y) = y(x-y) + 2.(x-y) = (x-y).(y+2) 

b, = (x+y)^2 - 9 = (x+y-3).(x+y+3)

Answer 2

\(xy-y^2-2x-2y\)   

=(xy-y).(2x-2y)

=y(x-y).2(x-y)

=(x-y).(y-2)

Answer 3

camr ơn bạn nha

Answer 4

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

\(=\left(xy-y^2\right)+\left(2x-2y\right)\)

\(=y\left(x-y\right)+2\left(x-y\right)\)

\(=\left(x-y\right)\left(y+2\right)\)

\(x^2+2xy+y^2-9\)

\(=\left(x+y\right)^2-3^2\)

\(=\left(x+y-3\right)\left(x+y+3\right)\)

Answer 5

\(a,=y\left(x-y\right)+2\left(x-y\right)\)

\(=\left(x-y\right)\left(y+2\right)\)

\(b,=\left(x^2+2xy+y^2\right)-3^2\)

\(=\left(x+y\right)^2-3^2\)

\(=\left(x+y+3\right)\left(x+y-3\right)\)

Answer 6

ko có gì đâu

Answer 7

a ) xy-y²+2x-2y = y(x-y) + 2(x-y)

                       =(x-y)(y+2)

b ) x²+2xy+y²-9 = (x+y)²-3²

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