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在平时的数学学习和作业中,经常遇到逻辑联结词“和”、“或”、“且”.初学时容易混淆,应用时模棱两可.为帮助学生准确理解和运用这三个联结词,现结合初一教材对它们加以比较.一、“和”表示并列之意,条件之间或结论之间具有平等关系,是同时发生或存在的事件例1____统称为有理数;____统称为实数;____统称为整数.答:整数和分数;有理数和无理数;正整数、0、负整数.例2多项式x~2y+5xy~2+2x-3y~2+4-x-7中,是同类项的有____.
In normal maths learning and homework, you often encounter the logical conjunction of “ and ”, “or ”, “and ” easy to confuse when beginning to use, ambiguous when applied to help students accurately understand and use this Three conjunctions, now combined with the first text to compare them. First, “and ” said the parallel meaning, between conditions or the conclusion of an equal relationship between the occurrence or existence of events simultaneously 1____ collectively referred to as the rational number ; ____ collectively referred to as real numbers; ____ collectively referred to as an integer. A: integers and fractions; rational numbers and irrational numbers; positive integers, 0, negative integers Example 2 polynomial x ~ 2y + 5xy ~ 2 + 2x-3y ~ 2 + 4- x-7, is the same item has ____.