http://zhidao.baidu.com/link?url=sRnT9R83upyd3aGCeq7bvjVhfQ3RfcM2Ha7PtPbON9WSS_n8fqGCARgRKC3guHEAFzrI0susYJnzDwGIQiBhZa
根号18-根号2分之9-根号3分之(根号3+根号6)+(根号3-2)的零次方
=3根号2-3/2根号2-1-根号2+1
=1/2根号
=3根号2-2分之3根号2-1-根号2-(根号3)分之1
=2分之3根号2-1-3分之根号3
=6分之(9根号2-6-2根号3)