Help mee please ~ อิ้งอิ้ง

23 ก.พ. 57 22:15 น. / ดู 251 ครั้ง / 0 ความเห็น / 0 ชอบจัง / แชร์

One Equals Zero
The error occurred when the factor x - 1 was canceled. Because x = 1, x - 1, and it is obviously incorrect to deduce from the statement 0 * (x + 1) = 0 that x + 1 = 1. Canceling factors without considering the possibility that a factor could be Zero is a common error.
• Cancellation is division of both sides of an equation by the same nonzero factor. This activity serves as a warning against dividing both sides of an equation by a factor that could be zero. The purpose of this activity is to accentuate the danger of forgetting that cancellation is defined as dividing both sides by a nonzero factor.
• When students have completed this activity, they may consider the formal reason for ruling out division by zero of any nonzero number and for ruling out division by zero of zero, which are very different from each other. The reason in both cases is that division by zero cannot be well defined. Division of a nonzero number by zero is undefined because there is no solution to the equation a * 0 = b if b is not zero. If b s zero, there are infinitely many solutions to a * 0 = b and division by zero cannot be uniquely difined, which is the same as saying that it is not well defined.
See Also
See also Activities 2, 3, 7, 15, and 26.
แก้ไขล่าสุด 23 ก.พ. 57 22:15 | เลขไอพี : ไม่แสดง

อ่านต่อ คุณอาจจะสนใจเนื้อหาเหล่านี้ (ความคิดเห็นกระทู้ อยู่ด้านล่าง)




เป็นสมาชิกอยู่แล้ว ลงชื่อเข้าใช้ระบบ
ยังไม่ได้เป็นสมาชิก สมัครสมาชิกใหม่
หรือจะลงชื่อเข้าใช้ระบบด้วย Google หรือ Facebook ก็ได้
ลงชื่อเข้าใช้ระบบด้วย Facebook
ลงชื่อเข้าใช้ระบบด้วย Google