(1)计算:x2?y2x+y?4x(x?y)+y22x?y(2)化简求值:已知|a+12|+(b?3)2=0,求代数式[(2a+b)2+(2a+b)(b-2a)]÷2b的值.(3)分解因式:2a3-4a2b+2ab2