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救!數學(中一)

發問:

1)estimate whether the result of 22.6-13.8+31.7-5.2 is greater than 202)estimate whethrer the result of 22.6-13.8+31.7-5.2 is less than 603)miss chan buys 8 necklaces in a jewellery shop , each of them costing $8124 .use compensationstrategy to estimate the total cost of the 8 necklaces.4)a building has 35... 顯示更多 1)estimate whether the result of 22.6-13.8+31.7-5.2 is greater than 20 2)estimate whethrer the result of 22.6-13.8+31.7-5.2 is less than 60 3)miss chan buys 8 necklaces in a jewellery shop , each of them costing $8124 .use compensationstrategy to estimate the total cost of the 8 necklaces. 4)a building has 35 sterys.each storey has 22 flats . each flat can accommodate 3 to 6 people . Estimate the total number of residents in the building. 5)in a city , there are in average 5209 babies born in a month . Estimate the total number of new-born babies in 5 years in the city. 6)james goes for dinner with 5 friends to celebrate his birthday . the bill is shared equally among his friends .If each of them orders a set dinner oy $88.8 and there is no service charge , estimate how much does each of james'friends pay? 請回答!!!!1日!!!!好趕!!!!如有步驟,請寫 步驟...please

最佳解答:

1: yes 2.yes 3:8124X8=$64992 4:22X3 , 22X6=$66 -132 5:5209X12X5=$312540 6:88.8/6=$14.8 最佳please 做好耐...我form 2

其他解答:

Q.3,4,6: Mathematics in Action 1A Revision Exercise 5 Q.14-16 2010-12-08 21:00:18 補充： To 001: Q1, 2:You should explain your answer. Q.3, 5: You haven't do any estimation. Q.4: It shouldn't have any dollar sign. Besides, you've missed something. Q.6: You've missed something. 2010-12-08 21:05:28 補充： 1) Estimate whether the result of 22.6-13.8+31.7-5.2 is greater than 20A. 22.6-13.8+31.7-5.2~ 22-14+31-6 @= 33 > 20So, the result of 22.6-13.8+31.7-5.2 is greater than 20.@: Even we round down positive number and round up negative number, the result is still greater than 20.2) Estimate whether the result of 22.6-13.8+31.7-5.2 is less than 60A. 22.6-13.8+31.7-5.2~ 23-13+32-5 @= 37 20 So, the result of 22.6-13.8+31.7-5.2 is greater than 20. @: Even we round down positive number and round up negative number, the result is still greater than 20. 2010-12-08 21:06:04 補充： 2) Estimate whether the result of 22.6-13.8+31.7-5.2 is less than 60 A. 22.6-13.8+31.7-5.2 ~ 23-13+32-5 @ = 37