知道多一点

• 出 处: 课堂内外(小学低年级)
• 发表日期: 2004年期
• 关键词: 和差问题 三道

小朋友,已知两个数的和与差,求两个数各是多少的应用题,就叫作“和差问题”。本文中涉及的三道题都是这类题型。解答和差问题是有规律的,你看:从图中可以看出,两数之和加上两数之差,就是两个较大数之和,再除以2,就可以求出较大数;两数之和减去两数之差,就是两个较小数之和,再除以2,就可以求出较小数。

Children, known sum and difference between the two numbers, the number of the two numbers is how many applications, is called “and the difference problem ”. The three topics involved in this article are such questions. Answer and difference problems are regular, you see: As can be seen from the figure, the sum of the two numbers plus the difference between the two is the sum of the two larger numbers, and then divided by 2, you can find a larger The difference between the two numbers minus the difference between the two numbers is the sum of the two smaller numbers, divided by two to find the smaller number.