1/|1-√2|-√2+2^-2-0.25=
问题描述：
1/|1-√2|-√2+2^-2-0.25=
这题怎么算呀?我都没学过诶.
符号打的可能有些看不懂,我用文字表达下：一减根号二的绝对值分之一减根号二加二的负二次方减零点二五
答
=1/(√2-1)-√2+(1/2)²-0.25
=(√2+1)/[(√2-1)(√2+1)]-√2+0.25-0.25
=(√2+1)/(2-1)-√2
=√2+1-√2
=1