5[0.5(m-0.4)-0.1m]=2-0.5(m=4)
回答 (2)
2007-07-03 4:44 pm
✔ 最佳答案
m=4﹖圖片參考：http://hk.yimg.com/i/icon/16/17.gif
如果算式是m+4，
5[0.5(m-0.4)-0.1m]=2-0.5(m+4)
5[0.5m-0.2-0.1m]=2-0.5m-2
2m-1=0-0.5m
2.5m=1
m=2/5
如果算式是m-4，
5[0.5(m-0.4)-0.1m]=2-0.5(m-4)
5[0.5m-0.2-0.1m]=2-0.5m+2
2m-1=4-0.5m
2.5m=5
m=2
參考: 自己
2007-07-06 1:52 am
左邊個(m=4)，你係咪想話(m+4) ar。
計呢d數，只要慢慢折，唔好心急，就唔會亂ga la。
5[0.5(m-0.4)-0.1m] = 2-0.5(m+4)
5(0.5m-0.2-0.1m) = 2-0.5m-2
5(0.4m-0.2) = -0.5m
0.2m-2.5 = -0.5m
0.2m+0.5m = 2.5
0.7m = 2.5
m = 2.5/0.7=3.5714 (corr to 4 d.p.)
計呢d數，只要慢慢折，唔好心急，就唔會亂ga la。
5[0.5(m-0.4)-0.1m] = 2-0.5(m+4)
5(0.5m-0.2-0.1m) = 2-0.5m-2
5(0.4m-0.2) = -0.5m
0.2m-2.5 = -0.5m
0.2m+0.5m = 2.5
0.7m = 2.5
m = 2.5/0.7=3.5714 (corr to 4 d.p.)
收錄日期: 2021-04-13 14:03:27
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https://hk.answers.yahoo.com/question/index?qid=20070703000051KK00548