中一數學題

First , remove the 3 to the right. So we Have.

-a/4 = 3/2-3
-a/4 = -1.5

While -a = -b can be written as a = b, so .

a/4 = 1.5

Then, move 1/4 to the right. So we have.

a=1.5 x 4

And that is

a=6



Much easy than yours !_!


3 - a/4 = 3/2
- a/4 = 3/2 - 3
-a/4 = -1.5
a/4 = 1.5
a = 1.5 x 4
a = 6 //

2013-06-10 17:25:27 補充：
You need to 先乘除,後加減.

2013-06-10 17:26:24 補充：
Your answer is right, but the steps are totally wrong!! I think you have look the answer first, right???

心諾的答案錯了。

如果你的答案是3-a=6：

3-a=6

3-a-3=6-3

-a=3

a= -3

2013-06-08 08:46:48 補充：
你的第二步驟錯了，如果你的第二步驟是這樣：

-12a/4x4=3/2x4

除4和乘4後答案無變：

-12a=6

之後：

-12a/-12=6/-12

a= -5

計算後答案不是6。

應該是：

3-a/4=3/2

4(3-a/4)=4(3/2)

12-a=6

12-12-a=6-12

-a= -6

a=6

雖然你的最終答案是正確，但步驟錯了會令你計算錯誤。

3-a/4=3/2
2(3-a/4)=3
6-a/2=3
a/2=3
a=6

3-a÷4=3÷2
3-a÷4=1.5
3-a÷4×4=1.5×4
3-a=6
3-a+3=6+3
a=9

3-a/4=3/2
12-a =6
a = 6