25(x+y)²-9(x-y)²
=[5(x+y)]²-[3(x-y)]²
=[5(x+y)+3(x-y)][5(x+y)-3(x-y)]
=(8x+2y)(2x+8y)
=4(4x+y)(x+4y)=(8x+2y)(2x+8y) =4(4x+y)(x+4y)我感觉应该等于=2(4x+y)(x+4y)(8x+2y)(2x+8y) =[2(4x+y)]×[2(x+4y)] =2(4x+y)×2×(x+4y) =4(4x+y)(x+4y)
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