Question

已知m是根号2的小数部分,求根号m的平方+m的平方分之1-2

Answer 1

M=（根号2）-1
M^2=3-2根号2
M^2代到式子里：
根号（M^2+1/M^2-2）
=根号[3-2根号2+1/(3-2根号2)-2]
=根号[3-2根号2+(3+2根号2)-2]
=2