Question

一个班有49人其中男生的2/5和女生的3/8都参加数学兴趣小组。没有参加数学兴趣小组的人是多少人？

一个班有49人其中男生的2/5和女生的3/8都参加数学兴趣小组。没有参加数学兴趣小组的人是多少人？过程。

Answer 1

没有参加数学兴趣小组的人是30人。关键是人数必须为整数，即男生数是5的倍数，女生数是8的倍数，且男女相加为49。这样通常从大数8的倍数试起，只有8的3倍时能分，即女24人，男25人，则男的五分之二为10,女的八分之三为9,49-（10+9）=30

Answer 2

这个你要凑的，人总是整数个的，所以男生的人数是5的倍数，女生人数是8的倍数。应该是男生25人，女生24人，总共参加的是19人，没参加的是30人

Answer 3

如果硬要一个答案的话就要凑了 男生是5的倍数 女生8的倍数 因为人不可能是分数和负数

Answer 4

　　Way to School
　　this morning,my father took me to school by bike.i sat at the back of the bike,eating a banana.after i ate it up,i threw the skin onto the street randomly.
　　no sooner had i done this than i realized that i had done something bad to our environment.and maybe someone would step on it and tumbleover.i must pick it up.thinking of these,i asked father to stop.i jumped offthe bike and ran back to pick up the banana skin and threw it into a roadside dustbin.seeing this,father praised me and i felt very happy.
　　in future i will protect the surroundings more consciously and