用乘法公式分解因式1.1/2a^2-2ab+2b^22.2x^3y+8x^2y^2+8xy^33.-9x^2-3xy-1/4y^24.(x^2-x)^2+6(x^2-x)+95.(x^2-2x)^2+2x(x-2)+16.9a^2-30ab^2+25b^47.-4x^2+12xy-9y^28.9(2a-b)^2-6(2a-b)+19.-2m^3+24m^2-72m10.-x^4+2x^2y^2-y^411.(x+y)^2+4(x-y)^2-4(x^2-y^2)

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