# 我有幾題 maths 的題目(升中一)(20點)

請詳細說明，特別是括號的意思

第一題(-3)+(-2)-(-4)+(-1)=A.－10 B.－8 C.－2 D.0

第二題(-2)(-3)(+4)－(-5)(-6)=A.－6 B.6 C.24 D.56

第三題

(-4)(-6)-(-5)(-6)

打唔到分數線中間係分數線

(-5)(+2)-(-2)

=????

### 2 Answers

- WaiLv 61 decade agoFavorite Answer
1) (-3) (-2)-(-4) (-1)

=-3-2 4-1 ......to remove the bracket first, e.g. &- become -, i.e. minus

=-2

2) (-2)(-3)( 4) - (-5)(-6)

= (24) - (30)......Bracket& bracket ( ) ( ) means mutiplying.

= -6

3) (-4)(-6) - (-5)(-6)

------------------------------

(-5)( 2) - (-2)

= (24) - (30)

(-10) 2

= -6/-8

=3/4

Explanation: ( )( )---It means multiplying with each other.

for e.g. (-1)(-2) = 2

e.g.(-1)(2) =-2

e.e. (2)(2) =4

Explanation: e.g (-1)-(-2) = -1 2 =1

e.g. (-1-2) - (2-3) = (-3)-(-1) = -3 1 = -2

because - & - means plus

because - & + means minus

because + & + means plus

2008-07-31 23:49:19 補充：

Due to something wrong with the computer system, please note that the 1st question is as follows:

(-3)+(-2)-(-4)+(-1)

2008-07-31 23:52:27 補充：

Due to something wrong with the computer system, please note that the 3rd question for the 2nd

part is as follows:

= (24) -(30)

----------------

(-10) + 2

2008-08-01 00:00:04 補充：

Due to something wrong with the computer system, please note the the 2nd explnation(at the

bottom part) should be read as follows:

e.g. (-1)-(-2)=-1+2 =1

e.g. (-1-2)-(2-3)= (-3)- (-1) = -3 + 1 = -2

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- 1 decade ago
1.-3+(-2)-(-4)+(-1)

= -3-2+4-1

= 0

答案係 D

2.(-2)(-3)(4)-(-5)(-6)

= 24 - 30

= -6

答案係 A

3.24-30/-10+2

= -6/-8

= 3/4 (因為負負得正 ~ 同埋約簡)

2008-08-01 14:27:34 補充：

SORRY ~ 第1題打錯左 ~

答案係等於 -2 (C)

因為 -3-2 = -5

-5+4 = -1

-1-1 = -2 ~

Source(s): 自己計- Login to reply the answers