Question

一道数学题~求解答~~在线等！！急求！

根号8+(1/2)^-1-4cos45°-2除以1/2

Answer 1

根号8+(1/2)^(-1) -4cos45°-2除以1/2
=2根号2 + 2 - 4*(根号2)/2 - 2×2
=2根号2 + 2 - 2根号2 - 4
=-2

Answer 2

根号8+(1/2)^(-1) -4cos45°-2除以1/2
=2根号2 + 2 - 4*(根号2)/2 - 2×2
=2根号2 + 2 - 2根号2 - 4
=-2
求采纳，谢谢