100x5-5x98-9=?
回答 (12)
2006-12-18 2:00 am
✔ 最佳答案
100x5-5x98-9= 5 X (100 - 98 ) -9
= 1
2006-12-18 8:16 am
100x5-5x98-9
=500-5x98-9
=500-490-9
=10-9
=1
有1個更快的方法
100x5-5x98-9
=5x(100-98)-9 (抽公因子5出黎,即5x(100x1-98x1))
=5x2-9
=10-9
=1
=500-5x98-9
=500-490-9
=10-9
=1
有1個更快的方法
100x5-5x98-9
=5x(100-98)-9 (抽公因子5出黎,即5x(100x1-98x1))
=5x2-9
=10-9
=1
2006-12-18 3:42 am
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2006-12-18 2:04 am
口訣:先乘除,後加減。
可以睇成:(100x5)-(5x98)-9
所以先做乘既部份...
STEP 1: 100x5= 500
5x98= 490
之後做減既部份...
STEP 2: (500)-(490)-9
=1
可以睇成:(100x5)-(5x98)-9
所以先做乘既部份...
STEP 1: 100x5= 500
5x98= 490
之後做減既部份...
STEP 2: (500)-(490)-9
=1
2006-12-18 2:01 am
100x5-5x98-9
=500-490-9
=1
=500-490-9
=1
2006-12-18 2:01 am
100 x 5 - 5 x 98 - 9
= 500 - 490 - 9
=1
= 500 - 490 - 9
=1
2006-12-18 1:58 am
59 lo~
收錄日期: 2021-04-12 22:37:13
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https://hk.answers.yahoo.com/question/index?qid=20061217000051KK03563