x的6次方-x²y的4次方=x²(x的4次方-y的4次方)=x²(x²+y²)(x²-y²)=x²(x²+y²)(x+y)(x-y)很高兴为您解答,【the 1990】团队为您答题.请点击下面的【选为满意回答】按钮...