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
2006-10-16 13:58:39 · 2 個解答 · 發問者 ? 6 in 科學 ➔ 數學
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
2006-10-16 14:01:15 · answer #1 · answered by J 7 · 0⤊ 0⤋
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
2006-10-16 14:02:39 · answer #2 · answered by STEVIE-G™ 7 · 0⤊ 0⤋