GWD31-9一道数学求解~~~麻烦大家啊

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dolorez

电梯直达

楼主

发表于 2009-12-6 10:56:21 | 只看该作者回帖奖励

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Dislance

kilometers

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18

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12

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6

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0

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0 1/4 1/2 3/4 1

Time(hours)

Reid took 1 hour to cycle from his home to his college.

The graph shows Reed’s distance from his college during

That hour. Reid’s average speed for the last 15 minutes

Of the hour was how many kifometers per hour greater

Than his average speed for the first 45 minutes?

A .3

B. 4

C. 5

D. 6

E.7

这个图也不知道对不对，里面的直线是过（0，24），斜率是负的，当X值为/1/2时Y值在6和9之间

0 1/4 1/2 3/4 1

Time(hours)

Reid took 1 hour to cycle from his home to his college.

The graph shows Reed’s distance from his college during

That hour. Reid’s average speed for the last 15 minutes

Of the hour was how many kifometers per hour greater

Than his average speed for the first 45 minutes?

A .3

B. 4

C. 5

D. 6

E.7

这个图也不知道对不对，里面的直线是过（0，24），斜率是负的，当X值为/1/2时Y值在6和9之间