F.1 math

1)  3k-(5k-18)=12-(18-2k)

2) 1 over 3 (h+9) = 1 over 6- 1 over 2 (h+11)

3)     718÷53.6x9.12
=718x(__÷__)
=718x(__÷__)
=718x1 over ?
=??

4)88.4x0.65-35.7÷4.2
=__x ? over 3-___÷___
=__-__
=?
....................
5)  1.4.5.9.14.23 (找出接著既3個項)
6)A有$2.$5.$10的硬幣
    $2係$5既3倍
$5比$10少5個硬幣
佢總共有$696

[[i] 本帖最後由 yuki_yan 於 2006-11-9 08:38 PM 編輯 [/i]]

1)  3k-(5k-18)=12-(18-2k)
     3k-5k+18  =12-18+2k
     3k-5k-2k    =12-18-18
     -4k             =-24
     -4k隨-4      =-24隨-4
     k                 =6

2)  1 over 3 (h+9) = 1 over 6- 1 over 2 (h+11)
     1over3h+3       = 1 over 6- 1 over 2h+5and1over2
  1over3h-1over2h= 1 over 6+5and1over2-3
     -1over6h           =2and2over3
-1over6h隨-1over6=2and2over3隨-1over6
      h                       =16

is this correct???
plx double check b4 you write
i am afraid that i will 害 you

[[i] 本帖最後由 ~蛋糕~ 於 2006-11-9 07:13 PM 編輯 [/i]]

thank you~