數學題．．．．．．

1.36x120%=36x1.2=43.2
2.77x10%=77x0.1=7.7
3.9800x105%=9800x1.05=10290
4.200x(1-10%)=200x(1-0.1)=180
5.500x(1-40%)=500x(1-0.4)=300

2007-04-30 11:46:03 補充：
5.500x(1-40%)x(1-35%)=500x(1-0.4)x(1-0.35)=500x0.6x0.65=195

36 X 120%
= 36 X 120 ÷ 100
= 43.2

77 X 10%
= 77 X 10 ÷ 100
= 7.7

9800 X 105%
= 9800 X 105 ÷ 100
= 10290

200 X (1-10%)
= 200 X (100%-10%)
= 200 X 90%
= 200 X 90 ÷ 100
= 180

500 X (1-40%) X (1-35%)
= 500 X (100%-40%) X (100%-35%)
= 500 X 60% X 65%
= 500 X 60 ÷ 100 X 65 ÷ 100
= 195

1.=43.2
2.=7.7
3.=10290
4.=180
5.=78

１．３６Ｘ１２０％
=36x1.2
=43.2
２．７７Ｘ１０％
=77x0.1
=7.7
３．９８００Ｘ１０５％
=9800x1.05
=10290
４．２００Ｘ（１－１０％）
=200x0.9
=180
５．５００Ｘ（１－４０％）Ｘ（１－３５％）
=500x0.6x.75
=300x0.75
=225
係咁計架>

1.
=36 * 1.2 = 43.2

2.
= 77 * 0.1 = 7.7

3.
= 9800 *1.05 = 10290
or = 9800 / 100 * 105 = 98 * 105 = 10290

4.
= 200 * 0.9 = 180
or = 200 / 100 * 90 = 2 * 90 = 180

5.
= 500 * 0.6 * 0.65 = 162.5

2007-05-01 03:36:59 補充：
打錯5.= 500 * 0.6 * 0.65 = 195

2007-05-10 12:43:59 補充：
大錯特錯!!!