Question

给出三个多项式:X=2a²+3ab+b²+b²,Y=3a²+3ab,Z=a

Answer 1

x+y

=2a²+3ab+b²+3a²+3ab

=5a²+6ab+b²

=(5a+b)(a+b)

x²-y²

=(x+y)(x-y)

=-4*2

=-8