F.1數學

1. (m+3)/2= -4m
m+3 = 2(-4m)
m+3 = -8m
9m = -3
m = -1/3

2.3d/4+12 = 3d
3d/4 = 3d﹣12
3d = 4(3d﹣12)
3d = 12d﹣48
-9d = -48
d = 48/9
d = 16/3

3. s/3+ -0.2(1-3s)??你應該打錯左個等號成加號...
s/3 = -0.2(1﹣3s)
s/3 = -0.2﹣(-0.6s)
s/3 = -0.2+0.6s
s = (-0.2+0.6s)3
s = -0.6+1.8s
-0.8s = -0.6
s = 0.75

1.m+3/2=-4m
m+1 1/2=-4m
1 1/2==-4m-m=3m
1 1/2=3m
1.5/3=m=0.5
2.3D/4+12=3D
3/D=3D-12

1. 5m = -3/2
10m=-3
M=-3/10 //

2. 3D/4 +12 =3D
3D +48 =12D
9D =48
D=48/9
D=16/3 //

3. s/3 + -0.2(1-3s)
點解冇等號 的 ??

如果 s/3 = -0.2(1-3s)
s=-0.6 (1-3s)
s -1.8s = -0.6
-0.8s = -0.6
s=0.6/0.8
s=3/4 //