cos45°*2+|2-根号2|-1
问题描述:
cos45°*2+|2-根号2|-1
答
cos45°*2+|2-根号2|-1
=根号2+2-根号2-1
=1
答
cos45°*2=根号2,|2-根号2|=2-根号2,根号2-根号2+2-1=1