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【正文】 = = (x+y)26(x+y)+9= 2x38x= 3ax2+6axy+3ay2= x24y2+4xy= = = [3(m+n)+(mn)][3(m+n)(mn)] (3m+3n+mn)(3m+3nm+n) (4m+2n)(2m+4n) 4(2m+n)(m+2n) (x+y3)2 2x(x24)= 2x(x+2)(x2) 3a(x2+2xy+y2)= 3a(x+y)2 _(x2+4y24xy) _(x2_4xy+4y2) _(x2y)2 六、乘風破浪 !把下列各多項式分解因式 : x2y2+x+y= =
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