首页 > 留学知识库

问题: 初中试题征解

解答:

{√2}=√2-[√2]=√2-1
{√3}=√3-[√3]=√3-1

分子:
{√3-2{√2}}={√3-2√2+2}
=√3-2√2+2-[√3-2√2+2]
=√3-2√2+2-0
=√3-2√2+2

分母:
{√3}^2-2{√2}^2-2
=(√3-1)^2-2(√2-1)^2-2
=4-2√3-6+4√2-2
=-2√3+4√2-4

Z=-1/2
[Z]=[-1/2]=-1