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GWD 29-22


Four extra-large sandwiches of exactly the same size were ordered for m

students, where m > 4.  Three of the sandwiches were evenly divided among

the students.  Since 4 students did not want any of the fourth sandwich, it

was evenly divided among the remaining students.  If Carol ate one piece

from each of the four sandwiches, the amount of sandwich that she ate would

be what fraction of a whole extra-large sandwich?

A. (m+4)/m/(m-4)

B.(2m-4)/m/(m-4)

C.(4m-4)/m/(m-4)

D.(4m-8)/m/(m-4)

E.(4m-12)/m/(m-4)

答案:E

想不通怎么得到答案的?

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第一次是3块m个人分,第二次是1块m-4个人分,个么:

3/m + 1/(m-4),通分一下得到E

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thanks a lot!

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QUOTE:
以下是引用tomrchu在2009-3-17 17:22:00的发言:

第一次是3块m个人分,第二次是1块m-4个人分,个么:

3/m + 1/(m-4),通分一下得到E

 

right

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