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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

Rating
  • Wai
    Lv 6
    1 decade ago
    Favorite 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

    • Commenter avatarLogin to reply the answers
  • 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
    • Commenter avatarLogin to reply the answers
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