Question

trước sáng mai ạ

Answer 1

1) 

a, \(A=\left(-x-5\right)\left(4x-3\right)\)

\(A=-4x^2+3x-20x+15\)

\(A=-4x^2-17x+15\)

b, \(A=\left(5x-2y\right)\left(x^2-xy-1\right)\)

\(A=5x^3-5x^2y-5x-2x^2y+2xy^2+2y\)

\(A=5x^3-7x^2y+2xy^2-5x+2y\)

2)

a, \(A=-\left(x-1\right)\left(-x^2+2\right)\)

\(A=\left(-x+1\right)\left(-x^2+2\right)\)

\(A=x^3-2x-x^2+2\)

\(A=x^3-x^2-2x+2\)

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

\(A=x^3y^2-x^2y^3-x^2y+xy^2+xy-y^2\)

3) 

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

\(A=-x^4-2x^2+2x^2+4\)

\(A=-x^4+4\)

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

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

\(A=\left(x-y\right)^3\)

\(A=x^3-3x^2y+3xy^2-y^3\)