1／4 ＋0．4＝1／5 ＋X ,X=?
請提供公式解答thanks
1／4 ＋0．4＝1／5 ＋X ,X=?
2014-03-09 2:34 am
回答 (6)
2014-03-15 1:19 am
that "point" is not a point but a cross, right? that means times, isn't it?
2014-03-13 6:41 pm
根據1／4 ＋0．4＝1／5 ＋X
=> 1/4+ 2/5=1/5+X
=> 1/4+2/5-1/5=X
=> 1/4+1/5 =X
=> 5/20+4/20=9/20=X
驗算: X=9/20 , 代入算式
1/4+0.4=1/5+9/20
=> 13/20=13/20
答案:X=9/20
=> 1/4+ 2/5=1/5+X
=> 1/4+2/5-1/5=X
=> 1/4+1/5 =X
=> 5/20+4/20=9/20=X
驗算: X=9/20 , 代入算式
1/4+0.4=1/5+9/20
=> 13/20=13/20
答案:X=9/20
2014-03-13 5:16 am
1／4 ＋0．4＝1／5 ＋X
5+8=4+20x
9=20x
x=9/20
Therefore x=9/20
5+8=4+20x
9=20x
x=9/20
Therefore x=9/20
2014-03-09 5:55 pm
1/4+0.4=1/5+X 1/4+0.4=1/5+X
這樣較簡單 這樣較複雜
1/4=0.25 1/5=0.2 0.4=2/5
0.25+0.4=0.2+X 1/4+2/5=1/5+X
0.65=0.2+X =13/20=1/5+X
X=0.65-0.2 X= 13/20-5/1
X=0.45(9/20) X=9/20(0.45)
這樣較簡單 這樣較複雜
1/4=0.25 1/5=0.2 0.4=2/5
0.25+0.4=0.2+X 1/4+2/5=1/5+X
0.65=0.2+X =13/20=1/5+X
X=0.65-0.2 X= 13/20-5/1
X=0.45(9/20) X=9/20(0.45)
參考: 標準答案 來自我........的計算機
2014-03-09 2:12 pm
1/4 (0.25) + 0.4= 1/5(0.2)+ X
0.65= 0.2+x
X=0.45 (9/20)
0.65= 0.2+x
X=0.45 (9/20)
參考: My calculator
收錄日期: 2021-04-13 20:17:00
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20140308000051KK00131