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五年制小学数学课本第五册42页的第12题:“一个班有48人。班主任在班会上问:谁做完语文作业?请举手!有37人举手。又问,谁做完数学作业?请举手!有42人举手。最后说:谁语文、数学作业都没做完?没有人举手。你想想看:这个班语文数学作业都做完的有多少人?”此题若运用集合的思想来解就很简便。因为根据题意,在48人中完成作业的情况只有三种:一种是只做完语文作业而没做完数学作业的;第二种是只做完数学作业,而没做完语文作业;第
Five-year primary school mathematics textbook fifth volume 42 page 12: “a class of 48. class teacher at the class meeting to ask: who finish the language homework? Please raise your hand! 37 people raised their hands. End of math homework? Please raise your hand! There are 42 people raised their hands. Finally, said: Who language, math homework did not finish? No one raised your hand. You think about it: This class language math homework done how many people? ”This problem can be solved easily by using the idea of a collection. This is because, according to the question, there are only three types of assignments completed among the 48 people: one is completion of language assignments and no completion of math assignments; the other is completion of math assignments only, and no completion of language assignments; No.