maths!!中1數學題..教教我,10分

[(2x(-10)+1)/2]x[(3x(-5)+1)/3]
-------------------------------------------
[(2x(-3)+1)/2]


(-21/2)x(-16/3)
= -------------------------------
(-7/2)

56
= -------------------
-3.5


= -16

2007-09-22 21:40:42 補充：
你用埋計數按再睇個答案教埋你按計數機[(-10 a b/c1a b/c 2)x(-5 a b/c1a b/c 3a b/c)]除(-3a b/c 1a b/c 2a b/c)個除號唔識打--"唔好以思!!希望幫到你

　1　　　　1
-10--- x -5--- (負10又2分之1 x 負5又3分之1=幾多??)
　2　　　　3
______________
　　　1
　 　-3-----
　　　2

(-21/2)(-16/3)
=______________
-7/2

=(336/6)(-7/2)
=56(-7/2)
=-169

=+56 (!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!)

21 16
= - -------- x - --------
2 3
=(-7)x(-8)

=+56

2007-09-22 19:08:37 補充：
21 16= - -------- x - -------- 2 3係等於 2分之負21 乘 3分之負16