(+5)+(-7)=? (-7)-(-12)+? (-7

🎓 學業台小學及中學教育

[匿名]

2007-07-16 10:55 pm

igyuiuigyuiyi

回答 (4)

[匿名]

2007-07-16 11:06 pm

✔ 最佳答案

(+5)+(-7)=? (-7)-(-12)+? (-7）
如果设？为A，呢条式等于
5-7=-7A+12-7A
-2=-14A+12
-14=-14A
1=A

那个？就是1了

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用戶144214

2007-07-19 3:55 am

(+5)+(-7)= -2

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用戶77770

2007-07-16 11:16 pm

(+5)+(-7)=? (-7)-(-12)+? (-7)
-2 = -7?+12-7?
-14=-14?
1=?

2007-07-16 15:17:25 補充：
******

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venus

2007-07-16 10:59 pm

(+5)+(-7)=? (-7)-(-12)+? (-7)
-2 = -7?+12-7?
-14=-14?
1=?

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