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(x的n次方+y的n次方)(x的n次方-y的n次方)-(x的n次方+y的n次方)²

题目详情
(x的n次方+y的n次方)(x的n次方-y的n次方)-(x的n次方+y的n次方)²
▼优质解答
答案和解析
原式=x的2n次方-y的2n次方-(x的2n次方+2乘以x的n次方乘以y的n次方+y的2n次方)
=x的2n次方-y的2n次方-x的2n次方-2乘以x的n次方乘以y的n次方-y的2n次方
=-2乘以x的n次方乘以y的n次方-2乘以y的2n次方