[(x+2y)(-2y)+(x-2y)²]÷(6x)

问题描述:

[(x+2y)(-2y)+(x-2y)²]÷(6x)

=(-2xy-4y²+x²-4xy+4y²)÷(6x)
=(-6xy+x²)÷(6x)
=-y+x/6