cos45°*2+|2-根号2|-1

问题描述:

cos45°*2+|2-根号2|-1

cos45°*2+|2-根号2|-1
=根号2+2-根号2-1
=1

cos45°*2=根号2,|2-根号2|=2-根号2,根号2-根号2+2-1=1