4x²+1/4-9y²-2x(因式分解,
问题描述:
4x²+1/4-9y²-2x(因式分解,
答
4x²+1/4-9y²-2x
=1/4(16x²-8x+1)-9y²
=1/4(4x-1)²-9y²
=(2x-1/2)²-9y²
=(2x-1/2+3y)(2x-1/2-3y)