Résolution de problèmes et analyse de données
SAT Sujet 7 3:46 Narration en anglais · Sous-titres anglais + 中文 incrustés
Chapitres
Transcript
A rate compares quantities with their units.
速率用于比较带有单位的量。
v equals d divided by t, which is 90 kilometres divided by 1.5 hours, equaling 60 kilometres per hour.
v等于d除以t，即90千米除以1.5小时，等于60千米每小时。
Convert using cancelling units: v equals 60 kilometres per hour, times 1000 metres per kilometre, all over 3600 seconds per hour, equaling 50 over 3 metres per second.
使用约分单位进行换算：v等于60千米每小时乘以1000米每千米，再除以3600秒每小时，等于50/3米每秒。
Do not convert only the numerator of a compound rate.
不要仅对复合速率的分子进行换算。
Each task gives its own data.
每个任务都有其专属数据。
Do not copy the worked example’s numbers.
请勿照搬例题中的数值。
Pause here and attempt the task before revealing the reasoning.
请先暂停，完成这道原创练习再继续。
Use the full context on the preceding pages.
请利用前几页的完整背景信息。
There are 11 parts, so each is 3 litres.
一共十一份，所以每份三升。
The red volume is 33 times four elevenths, which is 12 litres; the blue volume is 33 times seven elevenths, which is 21 litres.
红色的体积是三十三乘十一分之四，等于十二升；蓝色的体积是三十三乘十一分之七，等于二十一升。
The cost is 18 yuan per litre times 12 litres, plus 12 yuan per litre times 21 litres, which is 468 yuan.
费用是每升十八元乘十二升，加上每升十二元乘二十一升，等于四百六十八元。
Pause here and attempt the task before revealing the reasoning.
请先暂停，完成这道原创练习再继续。
Use the full context on the preceding pages.
请利用前几页的完整背景信息。
Use successive multipliers.
使用连续乘数。
The new price is 400 yuan times 0.85 times 1.1, which is 374 yuan.
新价格等于四百元乘零点八五再乘一点一，即三百七十四元。
The relative change is 374 minus 400, over 400, which is negative 0.065, a 6.5 percent decrease.
相对变化等于三百七十四减四百，再除以四百，即负零点零六五，也就是下降百分之六点五。
Pause here and attempt the task before revealing the reasoning.
请先暂停，完成这道原创练习再继续。
Use the full context on the preceding pages.
请利用前几页的完整背景信息。
The time is volume over flow rate, 54 litres over 0.15 litres per second, which is 360 seconds, or 6 minutes.
时间等于体积除以流量，即五十四升除以每秒零点一五升，等于三百六十秒，也就是六分钟。
Convert the side before squaring; the area is 0.3 metres squared, which is 0.09 square metres.
先换算边长再平方：面积等于零点三米的平方，即零点零九平方米。
The area conversion factor is 10000, not 100.
面积的换算系数是一万，而不是一百。
Return to the task and explain why the method fits.
回到任务中，解释该方法为何适用。
Original practice does not predict an official score.
原始练习无法预测正式成绩。
Complete required live or recorded evidence separately.
请单独完成所需的现场或录制证据。
Pause and test yourself. Cover the worked answer, rebuild the answer to the last example in your own words, and name one condition that would change it before you check.
暂停一下，自我检测：遮住示范答案，用自己的话重做最后一个例子的答案，并在核对之前说出一个会改变结论的条件。