2x+8(3x-5)=12 及仲有條數唔識

a.2x+8(3x-5)=12
2x+24x-40=12
26x-40=12
26x=12+40
26x=52
x=52/26
x=2

b.5(x-2)-3(6x-8)=5
5x-10-18x+24=5
-13x+14=5
-13x=5-14
-13x=-9
x=9/13

2x+8(3x-5)=12
2x+24x-40=12
26x=52
x=2

5(x-2)-3(6x-8)=5
(5x-10)-(18x-24)=5
5x-10-18x+24=5
-13x= -9
x=9/13

a. 2x+8(3x-5)=12
2x+24x-40=12
26x-40+40=12+40
26x÷26=52÷26
x=2

b. 5(x-2)-3(6x-8)=5
5x-10-18x+24=5
-13x+14-14=5-14
-13x=-9
x=13分之9

a.

2x+8(3x-5)=12
3x+8-5=12÷2x
3x+3=6÷x
3x+3x=6
6x=6
x=1

b. 5(x-2)-3(6x-8)=5
5x-10-18x-24=5
5x-18x=39
-18x=39-5x
18x=39+5x
18x-5x=39
13x=39
x=3

2007-03-17 15:10:03 補充：
唔好意思= =a. 2x 8(3x-5)=12 2x 24x-40=12 26x=52 x=52÷26 x=2b. 5(x-2)-3(6x-8)=5 5x-10-18x 24=5 -13x=-9 x=9÷13

a. 2x+8(3x-5)=12
2x+24x-40=12
26x=12+40
26x=52
x=2

b. 5(x-2)-3(6x-8)=5
5x-10-(18x-24)=5
5x-10-18x+24=5
5x-18x=5-24+10
-13x=-9
9
x = -----
13

2007-03-17 12:04:42 補充：
9x = ----- 13

2x+8(3x-5)=12
2x+24x-40=12
26x-40=12
26x=52
x=2

------------------------------
5(x-2)-3(6x-8)=5
5x-10-18x+24=5
14-13x=5
9=13x
x=9/13

a. 2x+8(3x-5)=12
2x+24x-40=12
26x-40=12
26x=12+40
26x=52
x=52除26(分數形式比較好)
x=2

2007-03-17 12:01:38 補充：
等號要對齊呀~頭先手快快就禁左回答~漏左b題~sorry!b. 5(x-2)-3(6x-8)=5 5x-10-18x 24=5 -13x 14=5 13x 5=14 13x=14-5 13x=9 x=9除13(分數形式)

a. 2x+8(3x-5)=12
2x+24x-40=12
26x-40+40=12+40
26x=52
x=2

b. 5(x-2)-3(6x-8)=5
5x-10-18x+24=5
-13x-10+24+10-24=5+10-24
-13x=-9
x=9/13

a)
2x+8(3x-5)=12
2x+8(3x)-8(5)=12
2x+24x-40=12
26x=52
x=52/26=2

b)
5(x-2)-3(6x-8)=5
5x-5(2)-3(6x)+3(8)=5
5x-10-18x+24=5
-13x=5-24+10
x=(-9)/(-13)=9/13

a. 2x+8(3x-5)=12
2x(3x-5) + 8(3x-5) =12
6x2次方 - 10x + 24x - 40 =12
14x -40 + 6x2次方 =12


b. 5(x-2)-3(6x-8)=5
5x-10-18x+24 = 5
-13x +14 =5

要唔要計埋未知數??}