王老师买来一根绳子，长20米，剪下5米修理球网，还剩多少米？;r3X'p3|6n1[0D-j0X9d6v
算式：提示;S4g+k7k7D4S:c;r3X'p3|6n1[0D-j0X9d6v
口答：还剩1q5r:{(k米。;r3X'p3|6n1[0D-j0X9d6v