小兰今年10岁，爷爷72岁．小兰比爷爷小多少岁？+K8Y5N4F3r4j/Q0k
算式：提示0s-K'M+l5?3]9m+K8Y5N4F3r4j/Q0k
答：小兰比爷爷小'I+y3y,`:F8M-X7@2E.t,Z岁。+K8Y5N4F3r4j/Q0k