**急急急 升中一MATHS

Q1.
75%x = 12
(75/100)x = 12
75x = 1200
x = 16

Q2.
0.15x = 6
(15/100)x = 6
x = 40

Q3.
2x/3 = 16
2x = 48
x = 24

Q4.
1/5 = (2x-1)/21
21 = 5(2x-1)
21 = 10x - 5
10x = 26
x = 13/5

Q5.
0.4y - 1/2 = 18
4y/10 - 1/2 = 18
4y - 5 = 180
4y = 185
y = 185/4

Q6.
8/z = 16
8 = 16z
z = 1/2

Q7.
(1/3)(4x-3) = 1
4x-3 = 3
4x = 6
x = 3/2

你D問題走晒位,
我可能會睇錯題目,
每一題答案既第一步都係原本條題目,
你check下有無錯先好抄~~

**急急急 升中一MATHS
方程 須例色




1)
75%x=12
x=12/0.75
x=16

2)
0.15x = 6
x=6/0.15
x=40

3)
3分之2 x =16
2x=16*3
2x=48
x=24

4)1 2x - 1
-- = ---------
5 21

5)
1
0.4y - -- = 18
2

6) 8
-- = 16
z

7)
1
-- (4x - 3 ) = 1
3

1)
75%x=12
x=12除75%
x=16

2)
0.15x = 6
x = 6除0.15
x = 40

3)
3分之2 x=16
x=16除3分之2
x=24

4) 5分之1=2x－1分之21
2又5分之3=x

5) 0.4y－2分之1=18
y=46又4分之1

6) 8
-- = 16
z

z=0.5

7)1
-- (4x - 3 ) = 1
3

可能ｘ＝６




ｓｏｒ，冇步驟．．．

1) 75%x=12
0.75x = 12
x = 12 ÷ 0.75
x = 16

2) 0.15x = 6
x = 6 ÷ 0.15
x = 40

3) 3分之2 x =16
(2/3) x = 16
x = 16 ÷ (2/3)
x = 16 * (3/2)
x = 24

4) (1/5) = (2x – 1) / 21
21 = 5 * (2x –1 )
21 = 10x – 5
10x = 21 + 5
x = 26
x = 26/10
x = 13/5
x = 2 + (3/5)
x =2 又 5分之3

5) 0.4y – ½ = 18
0.4y = 18 + ½
0.4y= 18.5
y = 18.5 ÷ 0.4
y = 46.25 or (= 46¼)

6) 8/z = 16
8 = 16z
z = 0.5 = ½

7) (1/3) (4x – 3) = 1
(4x – 3) = 3
4x = 3 + 3
4x = 6
x = 6/4
x = 1.5
x = 1½

1)

75%x=12
0.75x = 12
x = 12 ÷ 0.75
x = 16

2)

0.15x = 6
x = 6 ÷ 0.15
x = 40

3)

3分之2 x =16
(2/3) x = 16
x = 16 ÷ (2/3)
x = 16 * (3/2)
x = 24

4)

(1/5) = (2x – 1) / 21
21 = 5 * (2x –1 )
21 = 10x – 5
10x = 21 + 5 = 26
x = 26/10 = 13/5 = 2 + (3/5) {……2 又 5分之3….}

5)

0.4y – ½ = 18
0.4y = 18 + ½ = 18.5
y = 18.5 ÷ 0.4
y = 46.25 = 46¼

6)

8/z = 16
8 = 16z
z = 0.5 = ½

7)

(1/3) (4x – 3) = 1
(4x – 3) = 3
4x = 3 + 3 = 6
x = 6/4 = 1.5 = 1½

1)
75%x=12
x=12/75%
x=16

2)
0.15x=6
x=6/0.15
x=40

3)
2x
-----=16
3
2x=48
x=24

4)+5)你打左d咩?

6)
8
---=16
z
8=16z
8
---=z
16
z=1/2

7)

1/3(4x-3)=1
4/3x-1=1
4/3x=2
x=4/3x2
x=8/3

唔係好明呀...
你不如delete咗佢la..
then再問過...
唔該分數用"幾分之幾"(例﹕3分之2)
仲有我唔明邊d係x(代數)，邊d係乘號
所以唔該寫明﹕x=代數，*=乘號

用計數機la!!