MQ1 --- Simple Calculation
2012-04-29 6:48 am
Difficulty: 10%Evaluate 88888×77777-22222×44440+44444×66666 without using calculator.
回答 (1)
2012-04-29 6:58 am
✔ 最佳答案
Let x = 11111Then 88888 x 77777 - 22222 x 44440 + 44444 x 66666
= (8x)(7x) - (2x)(4x - 4) + (4x)(6x)
= 72x^2 + 8x
= 8x(9x + 1)
= 88888(99999 + 1)
= 88888(1000000)
= 8 888 800 000
2012-04-28 23:00:50 補充：
Last 2 lines:
= 88888(100000)
= 8 888 800 000
參考: Knowledge is power.
收錄日期: 2021-04-13 18:39:25
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20120428000051KK00886