asked in 科學及數學數學 · 10 years ago

# P6升s.1數學暑期作業4題. 急~10 點 !!!!!

1.if A is y℅ more than B , then B is y℅ less than A. [ CORRECT / INCORRECT ]

2.Cherry put 4 marbles into a cylinder which is fully filled with water.Some water is then displaced into a rectangular container of length 5 cm and width 6 cm.When 8 more marbles are put into the cylinder, more water is displaced such that the water level in the rectangular container is raised from 1 cm to 3 cm. Find the volume of a marble.

Hint:The total volume of the marbles is equal to the volume of water displaced.

3.January;300 Februaury;300 March;200 April; 500 May;600 June;800

describe the trend of the electricity bill in the past 6 months.Suggest a reason why the electricity bill shows such a trend. [ 如果我想話.過去6個月.電費一直上升.係因為4.5.6月快到夏天.所以會比較熱.mr . Lee 一家開多左冷氣.得唔得?!`教下我英文點寫 ?!`]

4.the marked price of a jacket is\$500.If the discount percentage is 20% , what is the selling price?

PS:部用英文答.要解釋.唔好淨係比個答案我~THx.

Update:

Rating
• 10 years ago

if A is y℅ more than B,b is ((a-b)/a)*100%

(2*5*6)/8=7.5

the bill keep stable in january to february and fall a little in march,then the bill raise

rapidly from april to june.it is because mr.lee have to switch on the air-con in summer.

500*(1-20%)=500*80%

=400

我本暑期作業有D正負數.但係我未教過唔識做.咁做唔做好啊?!`

用計數機

2010-08-27 19:35:16 補充：

incorrect