我想知0.39 x 39 + 6.1 x 3.9 的簡易方法
回答 (7)
2007-03-28 6:20 am
✔ 最佳答案
因0.39*39=3.9*3.9即0.39 x 39 + 6.1 x 3.9
=3.9*3.9+6.1*3.9
=3.9*(3.9+6.1)
=3.9*10
=39
2007-03-29 11:10 pm
0.39x39+61x3.9
=39x39x61x39
=39x39x61x39
2007-03-28 6:28 pm
0.39 x 39 + 6.1 x 3.9
=15.21+ 6.1 x 3.9
=15.21+23.79
=39
=15.21+ 6.1 x 3.9
=15.21+23.79
=39
2007-03-28 6:47 am
0.39 x 39 + 6.1 x 3.9
=3.9x3.9+6.1x3.9
=3.9(3.9+6.1)
=3.9x10
=39
或
0.39x39+6.1x3.9
=0.39x39+61x0.39
=0.39(39+61)
=0.39x100
=39
或
0.39x39+6.1x3.9
=0.39x39+0.61x39
=39(0.39+0.61)
=39x1
=39
=3.9x3.9+6.1x3.9
=3.9(3.9+6.1)
=3.9x10
=39
或
0.39x39+6.1x3.9
=0.39x39+61x0.39
=0.39(39+61)
=0.39x100
=39
或
0.39x39+6.1x3.9
=0.39x39+0.61x39
=39(0.39+0.61)
=39x1
=39
2007-03-28 6:44 am
非常易
睇住啦
0.39*39+6.1*3.9
呢條數好簡單姐
你把3.9除以10
再把6.1乘以10
明唔明
未明?
唔緊要
簡單d黎講
姐係6.1*3.9係一個縮小若干
另一擴大若干
條數係咁計
0.39*39+6.1*3.9
=0.39*39+61*0.39
乘法分配律學左未
=0.39*(39+61)
=0.39*100
=39
完整d:
0.39*39+6.1*3.9
=0.39*39+61*0.39
=0.39*(39+61)
=0.39*100
=39
睇住啦
0.39*39+6.1*3.9
呢條數好簡單姐
你把3.9除以10
再把6.1乘以10
明唔明
未明?
唔緊要
簡單d黎講
姐係6.1*3.9係一個縮小若干
另一擴大若干
條數係咁計
0.39*39+6.1*3.9
=0.39*39+61*0.39
乘法分配律學左未
=0.39*(39+61)
=0.39*100
=39
完整d:
0.39*39+6.1*3.9
=0.39*39+61*0.39
=0.39*(39+61)
=0.39*100
=39
參考: me!
2007-03-28 6:20 am
0.39 x 39 + 6.1 x 3.9
= 3.9 X 3.9 + 6.1 X 3.9 [ 即係前面的0.39除了10, 後面的39除番10就平衡返]
= 3.9 X (3.9 + 6.1)
= 3.9 X 10
= 39
= 3.9 X 3.9 + 6.1 X 3.9 [ 即係前面的0.39除了10, 後面的39除番10就平衡返]
= 3.9 X (3.9 + 6.1)
= 3.9 X 10
= 39
參考: 自己
收錄日期: 2021-04-12 22:16:48
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070327000051KK04594