maths

f.1/2(x+3)=1/3(2x-1)

1/2(x+3)=1/3(2x-1)...............x 6
3(x+3) = 2(2x-1)
3x + 9 = 4x - 2
x = 11


i.4(2x+1)-3(x-1)=17
4(2x+1) - 3(x-1) = 17
8x + 4 - 3x + 3 = 17
5x = 10
x = 2


k.(x-2)/3=1/2+x/6
(x-2)/3=1/2+x/6.............x 6
2(x-2) = 3 + x
2x - 4 = x + 3
x = 7


l.2x+3/3=x-1/2
(2x+3)/3=(x-1)/2............x 6
2(2x+3) = 3(x-1)
4x + 6 = 3x - 3
x = 3


o.4(b+1)-3(b-1)=4
4(b+1)-3(b-1)=4
4b + 4 - 3b + 3 = 4
b = -3


p.k/5+5=3k+5/8
問題有些問題
k/5+5=3k+5/8............x 40
8k + 200 = 120k + 25
112k = 175
k = 7/5
或
k/5+5=(3k+5)/8............x 40
8k + 200 = 5(3k + 5)
8k + 200 = 15k + 25
7k = 175
k = 25



r.x/6-x+1/8=1
問題有些問題
x/6 - x + 1/8 =1..........x 24
4x - 24x + 3 = 24
20x = - 21
x = 21/20
或
x/6 - (x+1)/8 =1..........x 24
4x - 3(x + 1) = 24
4x - 3x - 3 = 24
x = 27


t.3(2a-1)-2(a+1)=7
3(2a-1)-2(a+1)=7
6a - 3 - 2a -2 =7
4a = 12
a = 3


u.4(2x+1)-2(x-1)=12
4(2x+1)-2(x-1)=12
8x + 4 - 2x + 2 = 12
6x = 6
x = 1


v.2(3b-1)-3=3(b-3)=2
問題不清晰.

w.x+1/3=1/2+x/6
問題有些問題
x + 1/3 = 1/2 + x/6..............x6
6x + 2 = 3 + x
5x = 1
x = 1/5
或
(x + 1)/3 = 1/2 + x/6..............x6
2(x + 1) = 3 + x
2x + 2 = x + 3
x = 1

x.x-3/3=x-1/2
(x - 3)/3 = (x-1)/2...............x6
2(x-3) = 3(x-1)
2x - 6 = 3x -3
x = -3


y.4x-1/2x=21
4x - 1/2x = 21..............x2
8x - x = 42
7x = 42
x = 6


z.4(b-1)-2(b+1)=10
4(b-1) - 2(b+1)=10
4b - 4 - 2b - 2 = 10
2b = 16
b = 8

f.1/2(x+3)=1/3(2x-1)
(x+3)/2=(2x-1)/3
3(x+3)=2(2x-1)
3x+9=4x-2
-x=-11
x=11

i.4(2x+1)-3(x-1)=17
8x+4-3x+3=17
5x+7=17
5x=10
x=2

k.(x-2)/3=1/2+x/6
(x-2)/3=3/6+x/6
3(3+x)=6(x-2)
9+3x=6x-12
-6x+3x=-21
-3x=-21
x=7

l.2x+3/3=x-1/2
2x=x-1/2-1
2x-x=-1/2-1
x=-1.5

o.4(b+1)-3(b-1)=4
4b+4-3b+3=4
b+7=4
b=-3

p.k/5+5=3k+5/8
k+25=15k+3/1/8
k=15k+3/1/8-25
-15k+k=-21.875
-14k=-21.875
k=1.5625]

r.x/6-x+1/8=1
x/6-x=1-1/8
x-6x=6-6/8
-5x=5/1/4
x=-1.05

t.3(2a-1)-2(a+1)=7
6a-3-2a-2=7
4a-5=7
4a=12
a=3

u.4(2x+1)-2(x-1)=12
8x+4-2x+2=12
6x+6=12
6x=6
x=1

v.2(3b-1)-3=3(b-3)=2
首先計算2(3b-1)-3=2
2(3b-1)-3=2
6b-2-3=2
6b-5=2
6b=7
b=1/1/6

然後計算3(b-3)=2
3(b-3)=2
3b-9=2
3b=11
b=3/2/3

w,x,y,z因為唔得閒,所以冇時間計,Sorry!

f. 1/2(x+3)=1/3(2x-1)
x+3=2/3(2x-1)
3x+9=4x-2
11=x
x=11

i 4(2x+1)-3(x-1)=17
8x+4-3x+3=17
5x+7=17
5x=10
x=2

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

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

o.4(b+1)-3(b-1)=4
4b+4-3b+3=4
b=4-7
b=-3

p.k/5+5=3k+5/8
k+25=15k+25/8
8k+200=120k+25
112k=175
k=25/16

r.x/6-x+1/8=1
-5x/6=7/8
x=-21/20

t.3(2a-1)-2(a+1)=7
6a-3-2a-2=7
4a-5=7
4a=12
a=3

u.4(2x+1)-2(x-1)=12
8x+4-2x+2=12
10x+6=12
10x=6
x=3/5

w.x+1/3=1/2+x/6
5x/6=1/6
x=1/5

x.x-3/3=x-1/2
????

y.4x-1/2x=21
7x/2=21
x=6

z.4(b-1)-2(b+1)=10
4b-4-2b-2=10
2b-6=10
2b=16
b=8

f.1/2(x+3)=1/3(2x-1)
6×1/2(x+3)=6×1/3(2x-1)
3(x+3)=2(2x-1)
3x+9=4x-2
9=x-2
11=x
x=11

i.4(2x+1)-3(x-1)=17
8x+4-3x+3=17
5x+7=17
5x=10
x=2

k.(x-2)/3=1/2+x/6
6x[(x-2)/3]=6x(1/2)+6x(x/6)
2(x-2)=3+x
2x-4=3+x
2x=7+x
x=7

2006-12-31 10:37:59 補充：
l.2x 3/3=x-1/26(2x) 6x(3/3)=6x-6(1/2)12x 6=6x-312x=6x-96x=-9x=-3/2o.4(b 1)-3(b-1)=44b 4-3b 3=4b 7=4b=-3p.k/5 5=3k 5/840(k/5) 40x5=40(3k) 40(5/8)8k 200=120k 258k=120k-175112k=-175(呢題應該錯)幫你咁的算......