1/12[3/2(3y-1)-6]=y
1.Alex and Eric invested $400000 to set up a company. If Alex's capital was more than twice Eric's capital by $70000, how much did Alex invest?
2.There are 700 rabbits and chickens in a farm. They have 1900 legs altogether. How many chickens are there?
mathematics
2007-01-03 12:53 am
回答 (1)
2007-01-03 1:35 am
✔ 最佳答案
1/12 (3/2 (3y-1)-6) = y3/2 (3y-1) -6 = 12y
9/2y-3/2-6 = 12y
9/2y - 15/2 =12y
-15/2 = 12y-9/2y
-7.5 = 7.5y
y = -1
1) Let $m be Alex's invest
(m-70000)/2 = 400000-m
m-70000=800000 -2m
3m = 870000
m = 290000
2) Let n be the chickens
2n + 4(700-n) = 1900
2n+ 2800-4n = 1900
-2n = -900
n = 450
收錄日期: 2021-04-13 16:02:03
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070102000051KK02979