小弟需要大大的幫助呀TAT
有D代數既我唔識 拜託晒~~~~~~~~~~~~~~~~~~~~~~~~~~~
10.A wooden bridge can support a weight up to 500 k. There are now x adults and y children,with a total weight of W kg, passing the bridge at the same time . Suppose each adult weights 60 kg and each child weight 30 kg,
(a) write down a formula about W.
(b) If there are 7 adults and 2 children passing the bridge support their total weight? Explain your answer.
代數 Basic Algebra
2013-10-06 7:04 pm
回答 (2)
2013-10-06 8:24 pm
✔ 最佳答案
a) 60x +30y = Wkgb) 60x+30y =Wkg
60(7)+30(2) = Wkg
420+60 =480kg
∴ The total weight of adults and children is 480kg.
Yes.
∵ The bridge is 500 kg and the weight of the people is 480 kg , 480kg＜500kg
∴ The bridge can support them to pass through.
Hope that can help you
2013-10-06 12:26:24 補充：
There is a problem:
Yes.
&because = ∵
2013-10-06 12:32:46 補充：
I'm sorry that can't show the symbol of a " 倒三角形" which means "由於"
It's reverse the ∴.
CORRECTIONS:
" 由於" The bridge is 500 kg and the weight of the people is 480 kg , 480kg＜500kg
∴ The bridge can support them to pass through.
THX ^^
參考: Me, me
2013-10-06 7:47 pm
(a)60x+30y=W
(b)total weight of 7 adults and 2 children=60x7+30x2=480kg
because 480kg<500kg so the bride can support them to pass through.
(b)total weight of 7 adults and 2 children=60x7+30x2=480kg
because 480kg<500kg so the bride can support them to pass through.
收錄日期: 2021-04-20 14:21:42
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20131006000051KK00065