【正文】
關(guān)閉 D 2 . 若 a 為任意實(shí)數(shù) , 則下列式子一定是二次根式的是 ( ) A . ?? B . ??3 C . a D . 2 a 2 輕松嘗試應(yīng)用輕松嘗試應(yīng)用輕松嘗試應(yīng)用輕松嘗試應(yīng)用 1 2 3 4 5 答案 答案關(guān)閉 C ,屬于最簡二次根式的是 ( ) A. B. D. 輕松嘗試應(yīng)用輕松嘗試應(yīng)用輕松嘗試應(yīng)用輕松嘗試應(yīng)用 1 2 3 4 5 ( ) =1 B. +2=5 答