妈妈用20元买了6元的苹果，还剩多少元？0S*W(I5^7['y-w*E/O8Y'~:\
算式：提示0Z+s:{:W.@9e0S*W(I5^7['y-w*E/O8Y'~:\
答：还剩:t0{*R5V9x3H4W5H/N2I;E元。0S*W(I5^7['y-w*E/O8Y'~:\