x²-4y²+(x-2y) =(x+2y)(x-2y)+(x+2y) 接下来还怎么算?

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x²-4y²+(x-2y) =(x+2y)(x-2y)+(x+2y) 接下来还怎么算?

x²-4y²+(x-2y) =(x+2y)(x-2y)+(x+2y) 接下来还怎么算?
x²-4y²+(x-2y) =(x+2y)(x-2y)+(x+2y) 接下来还怎么算?

x²-4y²+(x-2y) =(x+2y)(x-2y)+(x+2y) 接下来还怎么算?
提取公因式.=(x+2y)(x-2y+1)