9(x+2y)^2-25(x-2y)^2=【 】^2-【 】^2=________.
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9(x+2y)^2-25(x-2y)^2=【 】^2-【 】^2=________.
9(x+2y)^2-25(x-2y)^2=【 】^2-【 】^2=________.
9(x+2y)^2-25(x-2y)^2=【 】^2-【 】^2=________.
9(x+2y)²-25(x-2y)²
=【3(x+2y)】²-【5(x-2y)】²
=[3(x+2y)+5(x-2y)][3(x+2y)-5(x-2y)]
=(8x-4y)(-2x+16y)
=-8(2x-y)(x-8y)
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