分解因式(1) -4x^2+2x-1/4 (2)8(x^2-2y^2)-x(7x+y)+xy
问题描述:
分解因式(1) -4x^2+2x-1/4 (2)8(x^2-2y^2)-x(7x+y)+xy
答
1) -4x^2+2x-1/4
=-(4x²-2x+1/4)
=-(2x-1/2)²
(2)8(x^2-2y^2)-x(7x+y)+xy
=8(x²-2y²)-7x²-xy+xy
=8x²-16y²-7x²
=x²-16y²
=(x+4y)(x-4y)