[(x+2y)(x-2y)-(2x-y)²+(3x-y(2x-5y)]/(-x)的解答

问题描述:

[(x+2y)(x-2y)-(2x-y)²+(3x-y(2x-5y)]/(-x)的解答

分子=x²-4y²-4x²+4xy-y²+6x²-17xy+5y²
=3x²-13xy
所以原式=(3x²-13xy)/(-x)=-3x+13y