来自化建宁的问题
因式分解:(X^3+Y^3)^2-9X^2Y^2(X+Y)^2
因式分解:(X^3+Y^3)^2-9X^2Y^2(X+Y)^2
1回答
2020-01-16 23:41
因式分解:(X^3+Y^3)^2-9X^2Y^2(X+Y)^2
因式分解:(X^3+Y^3)^2-9X^2Y^2(X+Y)^2
(X^3+Y^3)^2-9X^2Y^2(X+Y)^2
=[X^3+Y^3+3XY(X+Y)][X^3+Y^3-3XY(X+Y)]平方差公式
=(X+Y)^3[(X+Y)(X^2-XY+Y^2)-3XY(X+Y)]立方和公式
=(X+Y)^4(X^2-4XY+Y^2)提取公因式并化简