飛行里程

此文章來自奇摩知識+如有不便請留言告知

標題:

Maths 5識ar?

發問:

1, simple polynomialsA man buys n eggs at $3m each ad sells them at $(n-5m) each. After he has sold all the eggs, how much did he gain?2,simple equationsDivide $860 between Tom, Jack and Peter,so that Tom has $210 more than Jack,and Jack has $40 more than Peter. How much does each get?A and B two... 顯示更多 1, simple polynomials A man buys n eggs at $3m each ad sells them at $(n-5m) each. After he has sold all the eggs, how much did he gain? 2,simple equations Divide $860 between Tom, Jack and Peter,so that Tom has $210 more than Jack,and Jack has $40 more than Peter. How much does each get? A and B two consecutive numbers (B

最佳解答:

1, simple polynomials簡單的多項式 A man buys n eggs at $3m each ad sells them at $(n-5m) each. After he has sold all the eggs, how much did he gain? answer: $3m x n + $(n-5m)x n =$3mn + $n^2-$5mn n^2(即ｎ的２次方） =$n^2+$3mn-$5mn =$n^2-$2mn so he gained ($n^2-$2mn). 2,simple equations一次方程 Divide $860 between Tom, Jack and Peter,so that Tom has $210 more than Jack,and Jack has $40 more than Peter. How much does each get? answer Perhap Tom has $n , so Jack has ($n-$210) and Peter has ($n-210-$40) n+ (n-210) +(n-210-40)=860 n+ n-210 +n-210-40=860 n+ n+n-210 -210-40=860 3n-460=860 3n=860+460 3n=1320 n=440 so Tom has $n=$440 , Jack has($n-$210)= ($440-$210)= $230 and Peter has ($n-210-$40) =($440-$210-$40)=$190 Therefore , Tom has $440 , Jack has $230 and Peter has $190 a checking calculation 驗算： (a) $440 + $230 + $190 =$860 (b) Tom has $210 more than Jack $440-$210 =Jack=$230 (c)Jack has $40 more than Peter $230-$40=Peter=$190 All right~~!!!! ^^ 2007-07-09 15:57:55 補充： 改：1, simple polynomials簡單的多項式A man buys n eggs at $3m each ad sells them at $(n-5m) each. After he has sold all the eggs, how much did he gain?answer:$3m x n $(n-5m)x n=$3mn $n^2-$5mn n=$n^2 $3mn-$5mn=$n^2-$2mnso he gained ($n^2-$2mn).^2(即ｎ的２次方）

其他解答:A9A39959EDCC7BE3