明明有16枝铅笔，送给妹妹后还剩7枝，送给妹妹几枝？8]5w-R(|)D'^'x7I0h.j3I2}
算式：提示;J/f1U5R2t)^6s5H8]5w-R(|)D'^'x7I0h.j3I2}
答：送给妹妹'S+w1^.j1f枝。8]5w-R(|)D'^'x7I0h.j3I2}