25(x+y)²-9(x-y)²
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25(x+y)²-9(x-y)²
25(x+y)²-9(x-y)²
25(x+y)²-9(x-y)²
您好:
25(x+y)²-9(x-y)²
=[5(x+y)+3(x-y)][5(x+y)-3(x-y)]
=(8x+2y)(2x+8y)
=4(4x+y)(x+4y)
不明白,可以追问
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25(x+y)²-9(x-y)²
=[5(x+y)-3(x-y)][5(x+y)+3(x-y)]
=(2x+8y)(8x+2y)
=4(x+4y)(4x+y)