maths,,,,,,,,,,,,,,,,,help.................

2006-10-17 1:58 am
1. 0.3k+0.2k+5=-15

2. 6-3(4+7b)=36

3. 4m+3分1=1又3分2-3分1m

回答 (2)

2006-10-17 2:01 am
✔ 最佳答案
1.
0.3k+0.2k+5=-15
0.5k = -20
5k = -200
k = -40

2.
6-3(4+7b)=36

6 - 12 - 21b = 36
-6 - 21b = 36
-21b = 42
b = -2

3.
4m+3分1=1又3分2-3分1m
4m + 1 / 3 = 5 / 3 - m / 3
12m + 1 = 5 - m
13m = 4
m = 4 / 13
2006-10-17 2:02 am
1.
0.3k+0.2k+5=-15
0.5k=-20
k=-40

2.
6-3(4+7b)=36
6-12-21b=36
21b=-42
b=-2

3.
4m+3分1=1又3分2-3分1m
4又3分1 m =1又3分1
m=13分4


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