y+7
------ =3y
5
2y-3
------ =-2y+3
4
maths
2006-12-21 6:30 pm
回答 (3)
2006-12-21 6:37 pm
✔ 最佳答案
y+7------ =3y
5
y+7 = 3y x 5
y+7 = 15y
7 = 15y - y
7 = 14y
1/14 = y
0.5 = y
2y-3
------ =-2y+3
4
2y-3 = (-2y+3)x 4
2y-3 = -8y + 12
2y + 8y = 12+3
10y = 15
y=15/10
y = 1.5
2006-12-21 7:05 pm
１．
y+7
------ =3y
5
y+7=3yX5
y+7=15y
7=15y-y
7=14y
0.5=y／／ 1
----- =y
2
２．
2y-3
------ =-2y+3
4
2y-3=(-2y+3)X4
2y-3=-8y+12
2y+8y=12+3
10y=15
y=3 ／／／ y=1.5
----
2
y+7
------ =3y
5
y+7=3yX5
y+7=15y
7=15y-y
7=14y
0.5=y／／ 1
----- =y
2
２．
2y-3
------ =-2y+3
4
2y-3=(-2y+3)X4
2y-3=-8y+12
2y+8y=12+3
10y=15
y=3 ／／／ y=1.5
----
2
參考: 自己計
2006-12-21 6:38 pm
y+7
------ =3y
5
Y+7=15Y
15Y-Y=7
14Y=7
Y=7/14
Y=1/2
2y-3
------ =-2y+3
4
2Y-3=-8Y+12
2Y+8Y=12+3
10Y=15
Y=15/10
Y=1.5
------ =3y
5
Y+7=15Y
15Y-Y=7
14Y=7
Y=7/14
Y=1/2
2y-3
------ =-2y+3
4
2Y-3=-8Y+12
2Y+8Y=12+3
10Y=15
Y=15/10
Y=1.5
收錄日期: 2021-04-13 13:43:51
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20061221000051KK00716