y-12/7=20-y
12-y/2=y+16/5
y-5/2-6y/7=0
中一math
2009-12-22 7:39 pm
回答 (2)
2009-12-22 8:56 pm
✔ 最佳答案
7/1 x y-12/7 = 20-yy-12/7 = 140-7y
8y = 152
152/8 = 19
y=19
________________
12-y/2 = y+16/5
....into...
60-5y/10=2y+32/10
60-5y= 2y + 32
7y = 28
y= 4
___________________________
y-5/2 = 6y/7
....into....
7y-35 = 12y
12y-7y = -35
5y = -35
y = -7
參考: meeee
2009-12-22 7:47 pm
y-12/7=20-y
7y-12=140-7y....同乘7
14y-12=140
14y=152
y=76/7
12-y/2=y+16/5
120-5y=10y+32....同乘10
15y=88
y=88/15
y-5/2-6y/7=0
14y-35-12y=0....同乘14
2y=35
y=35/2
7y-12=140-7y....同乘7
14y-12=140
14y=152
y=76/7
12-y/2=y+16/5
120-5y=10y+32....同乘10
15y=88
y=88/15
y-5/2-6y/7=0
14y-35-12y=0....同乘14
2y=35
y=35/2
收錄日期: 2021-05-01 01:10:19
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20091222000051KK00442