數學題 負數

1. (-40)除(-7分之4)
=70
2. (-8分之5)除(+8.75)
= (-14分1)
3. (-36)+(-9)-(-18)
= (-27)
4. (+3)除(-7)除(+7分之1)
=3
5. 2分之3x = -8分之9
x = 4分3
6. 12+3x= -4-5x
x = 1.6

2007-08-13 16:21:11 補充：
第一果位既第6題一定錯.....6. 12 3x= -4-5x 16=-8xx=-2//

1) (-40)÷(-7分之4)
=40/(7分之4)
=160/7
=22又6/7

2) (-8分之5)÷(+8.75)
= -(8/5)÷(71/8)
= -(64/40)÷(355/40)
= -(64÷355)
= -64/355 or 大約 -0.180

3) (-36)+(-9)-(-18)
= -(36) -9+18
=18 -9 -36
= -27

4) (+3)÷(-7)÷(+7分之1)
= 3/ -7 x7
= -3

5) 2分之3x = -8分之9
2/3x= -(8/9)
6x= -8
x= -(4/3) or 大約 -1.333

6) 12+3x= -4-5x
3x+5x= -4 -12
8x = -16
x= -2

2007-08-13 16:43:57 補充：
對唔起！應該係咁樣 2) (-8分之5)÷( 8.75)= -(8/5)÷(70/8)= -(64/40)÷(350/40)= -(64÷350)= -32/175 or 大約 -0.183

2007-08-13 17:09:13 補充：
sor！！第1,5題都有問題...1) (-40)÷(-7分之4)=40/(7分之4)=280/4=705) 2分之3x = -8分之93/2x= -(9/8)12x= -9x= -(3/4) or -0.75樓上果位，一樓既答案有咩問題？

2007-08-13 17:10:56 補充：
一樓同三樓既第5題都錯=.=

1 +70
2 -14份之1
3 -19
4 +3

5，6 唔識呀~sor，幫你唔到

1. (-40)/(4/-7)
=40/(4/7)
=(40 x 7)/4
=70//

2. (-8分之5)/(+8.75)
=-1/14//

3. (-36)+(-9)-(-18)
=-36-9+18
=-27//

4. (+3)除(-7)除(+7分之1)
=3/-7/(1/7)
=3x7/-7
=-3//

5. 3x/2=9/-8
12x=-9
x=-1/4//

6. 12+3x= -4-5x
16=-8x
x=-2//

2007-08-15 18:15:35 補充：
你就錯