分解因式 4xy^2-2x^2y-y^3 (4a^2+1)^2-16a^2

问题描述:

分解因式 4xy^2-2x^2y-y^3 (4a^2+1)^2-16a^2

4xy^2-2x^2y-y^3=-y(2x²-4xy+y²)=-y(2x²-4xy+2y²-y²)=-y[2(x²-2xy+y²)-y²]=-y[2(x-y)²-y²]=-y[√2(x-y)+y][√2(x-y)-y]=-y(√2x-√2 y+y)...4xy^2-4x^2y-y^34xy^2-2x^2y-y^3=-y(2x²-4xy+y²) 提取-y=-y(2x²-4xy+2y²-y²) 把y²拆成+2y²-y²=-y[2(x²-2xy+y²)-y²]对2x²-4xy+2y²提取公因式2=-y[2(x-y)²-y²]对x²-2xy+y²分解因式得(x-y)²=-y[√2(x-y)+y][√2(x-y)-y]对[2(x-y)²-y²]运用平方差公式分解=-y(√2x-√2 y+y)(√2x-√2 y-y) 去中括号4xy^2-4x^2y-y^3=-y(4x^2-4xy+y^2)=-y(2x-y)^2�������对我按照你原来提供的系数算的没有注意到现在的变化祝贺你掌握解法了!!