数学课上,老师出了这样一道练习题:客车上原来有28人,到站后下车15人,上车24人,现在车上有多少人?我们班一部分学生是这样想的:先求出到站后下车15人,车上还剩2 8-15=13(人),再求又上车24人,现在车上有13+24=37(人)。综合算式:28-15+24=37(人)还有一部分学生这样想的:客车到站后下车15人,又上车24上,就等于上车了24-15=9(人),再加上原来车上的人数,现 Math class, the teacher out of such an exercise: the original bus has 28 people, arrived after getting off 15 people, on the train 24 people, how many people are in the car? Some students in our class think so: first seek After leaving the station to get off 15 people, the car left 2 8-15 = 13 (people), and then seeking to get on the train 24 people, and now the car has 13 +24 = 37 (people). Comprehensive formula: 28-15 +24 = 37 (people) There are still some students think so: get off the bus after 15 people, and on the bus 24, is equal to the car on a 24-15 = 9 (people), Coupled with the original car number, now