妈妈拿40元钱买了4双袜子,售货员找给她4元钱,一双袜子多少元钱?5j7l(?7P0n'i/S)r-[-q
算式:提示(K0T9Y;w)z3z0X6a6o5j7l(?7P0n'i/S)r-[-q
答:一双袜子;l-m5n6j;|4S.s(X9\:|2J,i,g元钱。5j7l(?7P0n'i/S)r-[-q