x2-{x2-[x2-(x2-1)-1]-1}-1.
题型:解答题难度:一般来源:不详
x2-{x2-[x2-(x2-1)-1]-1}-1. |
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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