x的平方+6xy+9y的平方-16a的平方+8a-

x的平方+6xy+9y的平方-16a的平方+8a-1

2个回答

x²+6xy+9y²-16a²+8a-1
=(x²+6xy+9y²)-(16a²-8a+1)
=(x+3y)²-(4a-1)²
=[(x+3y)+(4a-1)][(x+3y)-(4a-1)]
=(x+3y+4a-1)(x+3y-4a+1)