用方程解咖～～｀
１．造學校模型的圍欄,小芬用了木條0.6條,小玲則用了1.2米,兩人合共用了木條2.1米.每條木條長多少米?
２．卡紙原有三疊,小文拿了全部的1/10.他用了卡紙4張來做模型,仍剩餘11張.每疊卡紙原有多少張?
３．小文等三人均分一袋小模型樹.他把所得的其中5棵送給小華,仍剩餘模型樹19棵.該袋模型樹原有多少棵?
Ｍath 急急急～～～｀１０marks!!!
2007-03-16 11:53 pm
回答 (4)
2007-03-17 12:04 am
✔ 最佳答案
1) 設木條長 y 米,0.6y + 1.2 = 2.1
0.6y = 0.9
y = 1.5
2) 設每疊卡紙有 y 張,
3y * 1/10 - 4 = 11
3y * 1/10 = 15
3y = 150
y = 50
3) 設原有 y 棵樹,
y/3 - 5 = 19
y/3 = 24
y = 72
2007-03-18 12:48 am
0.6y + 1.2 = 2.1
0.6y = 0.9
y = 1.5
3y * 1/10 - 4 = 11
3y * 1/10 = 15
3y = 150
y = 50
y/3 - 5 = 19
y/3 = 24
y = 72
0.6y = 0.9
y = 1.5
3y * 1/10 - 4 = 11
3y * 1/10 = 15
3y = 150
y = 50
y/3 - 5 = 19
y/3 = 24
y = 72
2007-03-17 12:12 am
1) , 2.1米 - 1.2米 = 0.6 條
每條 = 1.2 米
2), 1/10 =4+11
每叠= (4+11)x10/3
=50 張
3), (19+5)x3 = 72 棵
2007-03-16 16:19:14 補充：
1) , 2.1米 - 1.2米 = 0.6 條每條 = 1.5 米
每條 = 1.2 米
2), 1/10 =4+11
每叠= (4+11)x10/3
=50 張
3), (19+5)x3 = 72 棵
2007-03-16 16:19:14 補充：
1) , 2.1米 - 1.2米 = 0.6 條每條 = 1.5 米
2007-03-17 12:06 am
1.
0.6x + 1.2 = 2.1
0.6x = 2.1 - 1.2
x = 0.9/0.6
x = 1.5
2.
3X x (1/10)=4+11
3.
x/3 = 5+ 19
哈哈
唔知啱唔啱
0.6x + 1.2 = 2.1
0.6x = 2.1 - 1.2
x = 0.9/0.6
x = 1.5
2.
3X x (1/10)=4+11
3.
x/3 = 5+ 19
哈哈
唔知啱唔啱
參考: me
收錄日期: 2021-04-19 16:05:40
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070316000051KK01899