中一數學題

2008-09-14 10:15 pm
1. (+48)÷(-2)=


2. +126/-9 =




3. (+7)÷(- 7/2)÷ (-2 )÷ (+1/4) =



4. (+2)x(-10)÷(+4)x( -1/5 )



5. -(-5)÷(- 1/3)÷(+3/4 ) x (-2)



6. Mr.Lee sells 250 pieces of Item A at a profit of $5 each, and 300 pieces of Item B at profit of $12 each, but 420 pieces of Item C at a loss of $20 each . What is the overall profit or loss made by Mr.Lee?

回答 (2)

2008-09-14 11:19 pm
✔ 最佳答案
1) -24
2) -14
3) 7
4) 1
5) 40
6) 250x5+300x12+420x(-2)
=1250+3600-840
=4010
he makes a profit $4010.
參考: me
2008-09-14 10:29 pm
其實你以上既題目都只係正負數+ 除法....
呢d數目都有一個共通點...只要你知道左就好易計...
我所講既方法係係我中1時做做下數發現的...
我都冇點同人提過...而我都唔知呢個方法係咪100%計到答案...
但我用呢個方法計都係冇點錯過...

我唔想係度講係因為我未肯定係咪100%得...
我唔想累到其他人因為我而計錯數...所以我唔係呢度講...

而如果你想知可sd e-mail俾我...我好樂意教你...

我唔係度講果幾條數既答案你知係想你明白個道理...
我想你真係明白點做...因為你只要識一題就等於識哂...
你都只需要用少少時間俾我係e- mail度教你就可以明白當中道理。

不過你唔接受我既方法都唔緊要...你就當我冇講過既就ok
參考: 自己


收錄日期: 2021-04-15 18:11:30
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