x2-{x2-[x2-(x2-1)-1]-1}-1.-数学

题目简介

x2-{x2-[x2-(x2-1)-1]-1}-1.-数学

题目详情

x2-{x2-[x2-(x2-1)-1]-1}-1.
题型:解答题难度:中档来源:不详

答案

x2-{x2-[x2-(x2-1)-1]-1}-1
=x2-{x2-[x2-x2+1-1]-1}-1
=x2-{x2-x2+x2-1+1-1}-1
=x2-x2+x2-x2+1-1+1-1
=0.

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