运用公式计算1.〔(3a+b)(3a-b)〕²2.(2x+y)²(2x-y)²3.(5m+2n)²—(5m-2n)²4.(-5x+3y-2z)²5.(-a-b+3)²6.(-3x-5y)²7.(-2a+3b-5c)(-2a-3b+5c)8.(3m-4n+2)(-3m-4n-2)9

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