(根号2+1)的负一次方+2sin30°-根号8等于多少

网友回答

(根号2+1)的负一次方+2sin30°-根号8
=(√2-1)/[(√2+1)(√2-1)]+2×1/2-2√2
=√2-1+1-2√2
=-√2======以下答案可供参考======
供参考答案1:
(根号2+1)的负一次方+2sin30°-根号8
=根号2-1+1-2根号2
= - 根号2