在新教材的学习中不少教师和同学认为命题 :“若ｘ +ｙ≠ 5 ,则ｘ≠ 2或ｙ≠ 3”( )是假命题 ,理由是 :命题 ( )成立 ,则命题 :“若ｘ+ｙ≠ 5 ,则ｘ≠ 1或ｙ≠ 4”也成立 ,即 :由命题( )的条件“ｘ +ｙ≠ 5”可得到无穷多个类似的结论 .这样 ,如同命题“若ｘ2 =9,则ｘ =3”( ) In the learning of new textbooks, many teachers and classmates think that the proposition “If x + y ≠ 5, then x ≠ 2 or y ≠ 3” () is a false proposition, the reason is: if the proposition () is established, then the proposition: “If x + y ≠ 5 , then x ≠ 1 or y ≠ 4 也 is also true, that is, an infinite number of similar conclusions can be obtained from the condition ”x + y ≠ 5“ of the proposition (). Thus, like the proposition ”if x2 = 9, then x = 3"()