因式分解 x²-16y²-8xy
问题描述:
因式分解 x²-16y²-8xy
答
x²-16y²-8xy
=x²-8xy+16y²-32y²
=(x-4y)^2-32y²
=(x-4y+4√2y)(x-4y-4√2y)
=【x+(4√2-4)y][(x-(4√2+4)y]