請幫忙計算及step by step 列式
1) Y x 80%=y-12
2) Y/3 + Y/12 Y =Y-12
(3份之Y)+ (12份之Y) = Y-12
如何計算-代數
2006-11-24 9:05 pm
回答 (3)
2006-11-24 10:05 pm
✔ 最佳答案
1) 80Y/100=Y-124Y/5=Y-12
4Y=5(Y-12)
4Y=5Y-60
Y=60
2) 4Y/12+Y/12=Y-12
5Y/12=Y-12
5Y=12Y-144
7Y=144
Y=144/7
應該啱架啦!
2006-11-24 9:34 pm
1. 0.8Y = Y-12
12 = Y-0.8Y
12 = 0.2 Y
12 /0.2 = Y
60 = Y
2. Y/3 + Y/12 ) =Y-12
12 * (Y/3 + Y/12) = 12 * (Y-12)
4Y + Y = 12Y-144
144 = 12Y -4Y - Y
144 = 7 Y
144/7 = Y
20 4/7 = Y
12 = Y-0.8Y
12 = 0.2 Y
12 /0.2 = Y
60 = Y
2. Y/3 + Y/12 ) =Y-12
12 * (Y/3 + Y/12) = 12 * (Y-12)
4Y + Y = 12Y-144
144 = 12Y -4Y - Y
144 = 7 Y
144/7 = Y
20 4/7 = Y
2006-11-24 9:15 pm
1) Y x 80% = Y - 12
0.8Y=Y - 12
Y-0.8Y=12
0.2Y=12
then Y= 60
2) Y/3 + Y/12 = Y - 12
通分母：
(4Y)/12 + Y/12=Y-12
(5Y)/12= Y-12
5Y = (Y-12) x 12
5Y= 12Y - 144
7Y=144
THEN Y=144/7
我唔知係咪你第二條題目有少少打錯，所以個答案唔係整數
你CHECK CHECK AR
0.8Y=Y - 12
Y-0.8Y=12
0.2Y=12
then Y= 60
2) Y/3 + Y/12 = Y - 12
通分母：
(4Y)/12 + Y/12=Y-12
(5Y)/12= Y-12
5Y = (Y-12) x 12
5Y= 12Y - 144
7Y=144
THEN Y=144/7
我唔知係咪你第二條題目有少少打錯，所以個答案唔係整數
你CHECK CHECK AR
收錄日期: 2021-04-23 16:05:29
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20061124000051KK01345