计算(x+2)(X-2)+(3x+2y)^2
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计算(x+2)(X-2)+(3x+2y)^2计算(x+2)(X-2)+(3x+2y)^2计算(x+2)(X-2)+(3x+2y)^2原式=x^2-4+9x^2+4y^2+12xy=10x^2+12xy
计算(x+2)(X-2)+(3x+2y)^2
计算(x+2)(X-2)+(3x+2y)^2
计算(x+2)(X-2)+(3x+2y)^2
原式=x^2-4+9x^2+4y^2+12xy
=10x^2+12xy+9y^2-4
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