1) A printer can print n copies in (3n+2) seconds at one time. How long does the printer take to print 20 copies?
2) The total cost of p oranges and q apples is $(3p+4.5q). How much does Mrs. Liu need to pay if she buys 10 oranges and apples?
請幫忙英數題列式(急)
2010-10-20 6:09 am
回答 (1)
2010-10-20 6:18 am
✔ 最佳答案
1) If n=20;(3n+2)=(3*20+2)
3*20+2
=60+2
=62 seconds
It takes 62 seconds to print 20 copies.
2) If p=10, q=10;
(3p+4.5q)=(3*10+4.5*10)
3*10+4.5*10
=30+45
=$75
Mrs. Liu needs to pay $75 if she buys 10 oranges and apples.
參考: me
收錄日期: 2021-04-23 18:26:53
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20101019000051KK01433