小图书室有90本图书,借出40本书,还剩下多少本?8F,@+s/r3U2k2_9Y/l*a+^
算式:提示(I6N;T9s8F,@+s/r3U2k2_9Y/l*a+^
答:还剩下,L4~)g(f:^7b5\5]2m3p)q本。8F,@+s/r3U2k2_9Y/l*a+^