暑期作業　快呀！！　９月１日交呀！＝＝

Q1.
德華新的月薪:
14000×(1 12%)
=14000×112%
=$15680

Q2.
他的英文減少了：
９０－７２／９０　×　１００％
＝１８／９０　×　１００％
＝２０％

Q3.
A. （ 5 ) ( - 7 )
= 5 - 7
= - 2

B. ( - 7 ) ( - 9 )
= - 7 - 9
= - 1 6

C. ( - 7 ) - ( - 1 2 )
= - 7 12
= 5

D. ( 5 ) . ( - 3 )
= - 15


設他的長是x :
3x ( 2 ) ［( x -3 ) (2)］= 4 2
6x ( 2x - 6 ) = 4 2
6x 2x - 6 = 4 2
8x - 6 = 4 2
8x = 4 2 6
8x = 4 8
x = 4 8 / 8
x = 6

A. X=1

x - 1
= 1 - 1
= 0

x 2 - 2 x - 3
= 1 ( 2 ) - 2 ( 1 ) - 3
= 2 - 2 - 3
= - 3

2 x 2 - x - 1
= 2 (1) 2 - 1 -1
= 2



B. X = 5

X-1
= 5 - 1
= 4

X2-2X-3
= 5 (2) - 2 (5) - 3
= 10 - 10 -3
= - 3

2X 2 - X - 1
= 2 ( 5 ) (2 - 5 - 1)
= 1 0 (-4)
= - 4 0


最尾果條唔係好明你打咩...
我唔知我有沒錯,,,
我都係幫到你咁多!!
仲有呀!
如果你唔識你最好都係去補吓習喇..
如果你F.1-3唔打好個底會好糟的!!
再唔係你可以問吓我~
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My answer:
1)
14,000x(1.12)
=$ 15,680

2)
(90-72) / 90 x100
=20%

3)負負得正,,正正得正,,正負得負
自己再諗下點計.

Btw,,u need to be polite...u cannot say "快呀！！""交呀！＝＝"
to others.That's not da way u call for help.
Please ask yr mum what is manner.

1.)14000+14000×12%

=15680(元)

2.)90-72除90×100%
=18除90×100%
=1除5×100%
=20%

3a.)+5-7
= -2

3b.)-7-9
= -16

3c.)-7+12
= +5

3d.)+5×-3
= -15

記住選我做最佳回答呀!