F.1方程式(快!!!!)

1.
x/2-1=3x
2(x/2-1)=2(3x)
x-2=6x
-5x=2
x=-0.4

2.
4x/5=5/4-3
20(4x/5)=20(5/4-3)
16x=25-60
16=-35
x=-2.1875

3.
2-0.5x=0.6
10(2-0.5x)=10×0.6
20-5x=6
-5x=-14
x=2.8

4.
4/5-5x=-3
5(4/5-5x)=5(-3)
4-25x=-15
-25x=-19
x=0.76

1) x-1=3x
x-3x=1
-2x=1
x=-0.5
2) 4x=5-3
4x=2
x=0.5
3) 2-0.5x=0.6
2-0.6=0.5x
1.4=0.5x
x=0.28
4) 4-5x=-3
4+3=5x
7=5x
x=1.4

1)2分之x-1=3x

(x- 1) / 2 = 3x
x -1 = 6x
5x = -1
x = -1 / 5

2)5分之4x=4分之5-3(←負3)

5 - 3????

3)2-0.5x=0.6

2 - 0.6 = 0.5x
0.5x = 1.4
x = 2.8

4)5分之4-5x=-3

(4 - 5x) / 5 = -3
4 - 5x = -15
5x = 19
x = 3.8