1 rút gon bta,(3x+2)^2-2(x-1)^2-7x^2b,(x-2)^2-(x+3)^2-5xc,2(x-y)(x+y)+(x+y)^2+(x-y)^2d,(2x+y)(2x-y)(4x^2+y^2)e,(x+2)^2-(x+2)(x-2)f,(3x+4)^2-(x-4)(x+4)-10x
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