1)4分之3d+12=3d
2)3分之s= -0.2(1-3s)
唔該你地,我要講住天日交功課~~
我想有人幫我解答這兩條數學
2006-11-28 5:36 am
回答 (3)
2006-11-28 5:54 am
✔ 最佳答案
1) (3/4)d+12=3d把兩邊乘4
3d+48=12d
9d=48
d=16/3或5又1/3
2) (1/3)s=-0.2(1-3s)
因為0.2=1/5,把兩邊乘15
5s= -3(1-3s)
5s=9s-3
3=4s
s=3/4
2006-11-28 6:03 am
唔知啱唔啱:
1. 3d/4+12=3d
3d/4+12-3d/4=3d-3d/4
12=(4*3d)/4-3d/4
12=12d/4-3d/4
12=9d/4
12*4=9d/4*4
48=9d
48/9=9d/9
5又9分之3(5又3分之1)=d
2.唔係好識，好怕答錯:
s/3=-0.2(1-3s)
s/3=-0.2-(-0.6s)
s/3=-0.2+0.6s-0.6s
s/3-0.6s=-0.2
s/3-s/3-3*0.6s/3=-0.2
s/3-1.8s/3=-0.2
-0.8s/3=-0.2
-0.8s=-0.6
s=0.75
1. 3d/4+12=3d
3d/4+12-3d/4=3d-3d/4
12=(4*3d)/4-3d/4
12=12d/4-3d/4
12=9d/4
12*4=9d/4*4
48=9d
48/9=9d/9
5又9分之3(5又3分之1)=d
2.唔係好識，好怕答錯:
s/3=-0.2(1-3s)
s/3=-0.2-(-0.6s)
s/3=-0.2+0.6s-0.6s
s/3-0.6s=-0.2
s/3-s/3-3*0.6s/3=-0.2
s/3-1.8s/3=-0.2
-0.8s/3=-0.2
-0.8s=-0.6
s=0.75
參考: my brain, may be wrong!!
2006-11-28 5:45 am
1
d=5 and 1/3
2
s=3/14
d=5 and 1/3
2
s=3/14
收錄日期: 2021-04-12 22:45:27
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20061127000051KK04758