數學題

emoh

請問如何將+,-,x,÷及( )放入:2, 5, 6, 10 而答案是24

lillymarie

原帖由 emoh 於 10-12-14 00:14 發表
請問如何將+,-,x,÷及( )放入:2, 5, 6, 10 而答案是24

(10/5 + 2) x 6 = 24

kittylam

2×6×10÷5=24

km1357

樓主: 你得4個數字, 又有4個operators, 好似有d問題???
(4個數字最多咪3個運算, 係咪?)

cornelius

原帖由 km1357 於 10-12-14 09:41 發表
樓主: 你得4個數字, 又有4個operators, 好似有d問題???
(4個數字最多咪3個運算, 係咪?)

I guess it's a game of applying +,-,x,÷, ( ) to the 4 numbers in order to arrive at the desired result, which is 24 in this case.  So it's not necessary to use all of them.  It reminds me of a funny game I used to play with my classmates: to open 4 playing cards chosen at random.  The one who first comes up with "24" with the four numbers will win.

A-Mum

Oh yes! This is an excellent game for kids who love maths!

I used to play on the street using car plate numbers  

Now my boy uses an iPhone app to play

http://itunes.apple.com/hk/app/twentyfour-lite-a-fun-math/id346978115?mt=8

[ 本帖最後由 A-Mum 於 10-12-14 14:04 編輯 ]

Chess

2 ÷ 5 x 6 x 10 = 24

Is it math olympiad question?

原帖由 emoh 於 10-12-14 00:14 發表
請問如何將+,-,x,÷及( )放入:2, 5, 6, 10 而答案是24

jessc

原帖由 Chess 於 10-12-14 14:58 發表
2 ÷ 5 x 6 x 10 = 24

Is it math olympiad question?

這類題目稱為「合24」，屬早年的數字推理題，
先想想那些數可構成24, 如20+4; 30-6; 12x2; 6x4; 120/5等會較易入手。