close
標題:
F.4 2題數學唔識做!! help!!! 高手!!
發問:
1.If the price of an apple rises by $1,then 4 fewer apples could be bought for $80.find the original price of an apple. 2.If the product of two consecutive number is 56,find the two number 詳細解答 pls !!!
此文章來自奇摩知識+如有不便請留言告知
最佳解答:
1)16 80/4 -4*1 2)let x be the smallest number x(x+1)=56 x^2+x-56=0 (x+8)(x-7)=0 x=7 or -8 (reject) so the smallest number is 7 i.e. the consecutive number are 7 and 7+1=8
其他解答:
1)Let the original price be x 80/x - 80/(x+1) = 4
文章標籤
全站熱搜
留言列表
