李元有210元钱,买书用去5/4,买文具的钱比买书的钱少85%.买文具用去多少元?

noticeTomorrow we will go to Boshan to organize the class outing, we will ride the bus to the foot, and then visit the mountainBeauty, sitting ropeways, watching the sunset, we are going to have a picnic at noon. Ask the students to prepare a meal or food and share them with your classmates. Finally, please carry essential items: such as camera flashlight sun umbrella cap, ask the students to the day after tomorrow in the morning at seven am with the school gate. Thank you for your cooperation. October 13th,2012

Hello,students.October31th,it means tomorrow,we will travel somewhere with teacher.Here are something you must remeber.First,please wear your school uniform and a pair of sports shoes.Second,you can take your own water or tea and some snacks.Third,don't play with fire,and be carefull,don'tleave our team,or you will be dangerous.
Fourth,listen to teacher and me.Remeber the time that we will meet at 7o'clock and we will meet again at about 5'oclock in the afternoon.We will meet at the school gat.I hope every one can have a good time!
Sunday,May 1st
I got to school very early.Our class took a special bus to Cuihua
Mountain at 8:30.We got off the bus.Our classmates were very excited.
The mountain is so beautiful .We can see flowers and grass here and
there.The air was so fresh ,the birds were singing happily.The mountain is covered with trees and is very steep in front of us.We seldom see such a beautiful picture.We could't wait to take many photos.Then we started to climb the mountain up the steep path.We climbed and climbed. We were all tired and reached the top of rhe
mountain.We were thirsty and hungry.It was the best way to sit down and had a good rest .Everyone took out of delicious food and drinks to share .This was a good chance to relax.We danced and sang for a long time,certainly we also took many pictures together.We all enjoyed the nature and had a good time on that day!
望采纳,谢谢

提干中的命题“如果赵川参加宴会，那么钱华、孙旭和李元将一起参加宴会”的逻辑形式是p→（q∧r∧s）。由于充分条件假言命题不能通过否定前件从而否定后件进行推理，所以A、B两项排除。充分条件假言命题也不能通过肯定后件从而肯定前件进行推理，所以C项排除。充分条件假言命题可以通过否定后件从而否定前件进行推理，所以有逻辑形式￢（q∧r∧s）→￢p。而￢（q∧r∧s）等值于￢q∨￢r∨￢s，由于相容选言命题不能通过肯定一部分选言支来断定另一部分选言之，所以排除D项。用排除法可知所以答案是E。从p→（q∧r∧s）可以看出p是q∧r∧s的充分条件，而q∧r∧s是p的必要条件，也就是说，只有钱、孙、李都参加，赵才会参加，只要钱、孙、李有一人不参加，赵就不会参加。因此当孙不参加时，虽然我们不知道李是不是参加，但是我们知道赵肯定不参加，所以有“如果孙没有参加宴会，那么赵和李不会都参加宴会”，答案是E.

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