急 !!求步驟同埋答案

1. 3x/2 - x/5 = x+3

(15x -2x)/10 = x +3
13x/10 =x+3
13x = 10(x+3)
13x = 10x +30
13x - 10x =30
3x =30
x=10

2. 5(x+1)/3 = 5x +10/8

(5x+5)/3 = (5x+10)/8
5x+5 =3(5x+10)/8
5x+5 = (15x+30)/8
8(5x+5)=15x+30
40x+40 = 15x+30
40x-15x =30-40
25x=-10
x=-10/25
x=-2/5

3. x-2/5-x+2/2=4
{2(x-2)-5(x+2)}/10 = 4
2x-4-5x-10 = 40
2x-5x = 40+4+10
-3x = 54
x=54/-3
x= - 18

4. 2x-5/3+x-1/2 =1/6

{2(2x-5)+3(x-1)}/6 = 1/6
4x-10+3x-3=1
4x+3x=1+10+3
7x=14
x=2

1. 3x/2-x/5 = x+3
15x/10-2x/5 = x+3
(15x-2x)/10 = x+3
13x/10 = x+3
13x = 10(x+3)
13x = 10x+30
13x-10x = 30
3x = 30
x = 10

因為我估你2 3 4題都小左d括號，所以我靠估黎加返d落去；
2. 5(x+1)/3 = 5x+10/8 如果係 5(x+1)/3 = (5x+10)/8 就可以咁計：
5(x+1)*8 = 5x+10*3
40x+8 = 15x+30
40x-30x = 30-8
10x = 22
x = 22/10
x = 2.2

3. x-2/5-x+2/2 = 4 如果係 (x-2)/5-(x+2)/2 = 4 就可以咁計：
(2x-4-5x-10)/10 = 4
-3x-14 = 4*10
-3x = 40+14
x = 54/-3
x = -18

4. 2x-5/3+x-1/2 = 1/6 如果係 (2x-5)/3+(x-1)/2 = 1/6 就可以咁計：
(4x-10+3x-3)/6 = 1/6
7x-13 = 1
7x = 1+13
7x = 14
x = 14/2
x =2

請問你可唔可以用中文講 " 加 、 減 、 乘 、 除 "

因為唔係ge話有好多種解法，唔係ge話要打好耐先講得哂咁多種可能

1.3x/2-x/5=x+3
(3/2-1/5-1)x=3
3/10x=3
x=1/10

2007-01-03 17:39:26 補充：
2.5(x+1)/3=5x+10/8(5/3-5)x=5/4-5/310/3 x = 5/12x = 1/8

2007-01-03 17:41:17 補充：
3.x-2/5-x 2/2=4(x已在過程中被抵消)4.2x-5/3 x-1/2=1/6 3x = 1/6 1/2 5/3 = 7/3x = 7/9