HeLP mE~*

(1) 0.4 + 0.6x = 0.8x + 12
0.2x = -11.6
x = -58

(2) 11x + 6x -45 - 8x = -5
9x = 36
x = 4

(4) 2(4 - 2x) - 15(2 - x) = 22
8 - 4x - 30 + 15x = 22
11x =44
x = 4

(5) 3/2 = q - 7q/8
12/8 = 8q/8 - 7q/8
12/8 = q/8
q = 12

(6) 5x/3 - 2x+3/6 = 7/2 - 2x/3
10x/6 - 2x+3/6 = 21/6 - 4x/6
8x+3/6 = 21-4x/6
8x+3 = 21-4x
12x = 18
x =1.5

ps：唔識第3題..but希望幫到你啦``

1. 0.4+0.6x=0.8x+12
0.4-12=0.8x-0.6x
-11.6=0.2x
-11.6÷0.2=x
x= -58

2 11x+6x-41-8x= -5
9x=36
x=4

3 5x-3x(3x+1)=21
5x-3xX3x+3x=21
有問題

4 2(4-2x)-15(2-x)=22
8-4x-30+15x=22
11x=22+30-8
11x=44
x=4

5 3/2=q-7q/8
3/2=q/8
3/2x8=q
q=12

6 5x/3-2x+3/6=7/2-2x/3
10x/6-12x/6+3/6=21/6-4x/6
2x=21/6-3/6
2x=3
x=3/2

碎料啦！

1 0.4+0.6x=0.8x+12

0.4-12 = (0.8-0.6)x

-11.6 = 0.2x

x = -58





2. 11x+6x-41-8x= -5

(11+6-8)x = -5+41

9x = 36

x = 4





3. 5x - 3x(3x+1)=21

5x -9x^2 -3x -21 = 0

9x^2-2x+21 = 0

你有無出錯題呀？？？？