题目内容
某小组有8名同学，从这个小组的男生中选2人，女生中选1人去完成三项不同的工作，每项工作应有1人，共有180种安排方法． (1)该小组中男生人数是5人． (2)该小组中男生人数是6人．
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今年弟弟8岁，姐姐14岁．当姐弟俩的岁数之和是n岁的时候，姐姐已经23岁． (1)n=40． (2)n=42．
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.The decrease 1 blood pressure occurred 2 race or 3 and whether or not study participants are a "typical American diet", 4 is high in saturated fats and contains few fruits and 5 or the so-called DASH (for Dietary Approaches to Stop Hypertension)diet, which emphasizes lots of fresh 6 , low-fat diary, fish and fewer sweets and which was proved in 1997 to reduce hypertension. The biggest decrease in blood pressure in this study was recorded in subjects who ate the DASH diet and reduced their sodium 7 to 1200mg a day.Why is this significant 8 -health experts estimate that Americans consume, on average, about 3500 mg of sodium- 9 about 9 grams of salt-daily. It"s not 10 we"re that heavyhanded with the saltshaker. Most of our dietary sodium is added 11 food processing. 12 to 1200mg, you"d have to forgo most 13 foods, take-out deliveries and restaurant meals.So pay attention 14 how much salt you"re eating, but don"t forget to make fruits, vegetables and whole grains a 15 part of your diet. They"ll help 16 your cholesterol level 17 your blood pressure. Be sure to drink alcohol 18 , if at all. 19 weight-even just 4.5kg-and exercising at least 30 minutes most days of the week can also have a marked 20 on blood pressure....
有一个正的既约分数，如果其分子加上24，分母加上54后，其分数值不变，那么此既约分数的分子与分母的乘积为
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