图书室有16本《少儿百科》,被小朋友借走后还剩9本,小朋友借走了多少本?/K;h,l,x/H0g'o'^'y
算式:提示0B+D.j)i'q/~.b,E7r/K;h,l,x/H0g'o'^'y
答:小朋友借走了3m'f4V0y4b本。/K;h,l,x/H0g'o'^'y