Question

很着急,(xy)^-1a^^x^-a^^y^3x^+6xy+3y^(x-y)^+4xy4a^-3b(4a-3b)^是2次

Answer 1

(xy)^2-1

=(xy+1)(xy-1)

a^4x^2-a^4y^2

=a^4(x^2-y^2)

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

3x^2+6xy+3y^ 2

=3(x^2+2xy+y^2)

=3(x+y)^2

(x-y)^2+4xy

=x^2-2xy+y^2+4xy

=x^2+2xy+y^2

=(x+y)^2

4a^2-3b(4a-3b)

=4a^2-12ab+9b^2

=(2a-3b)^2