因式分解:(1)-x^2/4-y^2+xy (2)(x-y)^3+4y^2y-4xy^2
问题描述:
因式分解:(1)-x^2/4-y^2+xy (2)(x-y)^3+4y^2y-4xy^2
答
(1)-x^2/4-y^2+xy=﹣1/4(x²-4xy+4y²)=﹣1/4(x-2y)²(2)(x-y)^3+4x^2y-4xy^2=(x-y)^3+4xy(x-y)=(x-y)[(x-y)²+4xy](中括号内的展开)=(x-y)(x+y)²不懂的还可以追问!满意请...