工人上山植樹,晴天每人每天植樹20棵,雨天每人每天植樹12棵,工人連幾天共112棵,平均每天植樹14棵.這幾天有雨天?
回答 (5)
2006-11-23 5:41 am
✔ 最佳答案
直樹的天數= 112 / 14 =8 (先求出工人種了多少天的樹)設x 是雨天的天數: (設x 是雨天的天數)
20*(8-x) + 12*(x) = 112
(己知x是雨天的天數，那麼把工人種植的天數減雨的天數便是晴天的天數(8-x)，20棵樹乘晴天加12棵樹乘陰天便等於112棵)
x = 6
答: 有6天是雨天
2006-11-23 1:57 am
Let no. of sunny day = x day, no. of rainy day = y day
Days = 112/14 = 8
x+y = 8
20x + 12y = 112
x= 8-y
so, 20(8-y) + 12y = 112
160-20y+12y =112
42 = 8y
y=6
so, there are 6 rainy days these days.
Days = 112/14 = 8
x+y = 8
20x + 12y = 112
x= 8-y
so, 20(8-y) + 12y = 112
160-20y+12y =112
42 = 8y
y=6
so, there are 6 rainy days these days.
2006-11-23 1:56 am
112/14=8天
睛天2天=20*2=40+雨天6天=12*6=72
Since 40+72=112
Therefore 雨天有6天
睛天2天=20*2=40+雨天6天=12*6=72
Since 40+72=112
Therefore 雨天有6天
2006-11-23 1:53 am
6天有雨天
2006-11-22 17:55:26 補充：
植樹共8天(112/14)2*20 6*12=112
2006-11-22 17:56:06 補充：
植樹共8天(112/14)2*20 6*12=112
2006-11-22 17:55:26 補充：
植樹共8天(112/14)2*20 6*12=112
2006-11-22 17:56:06 補充：
植樹共8天(112/14)2*20 6*12=112
收錄日期: 2021-04-30 00:51:50
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