sorry ,i think my question have no business of the english,but i don't know where can i issue it. |
by the way,how to caculate the last one to be 24? |
I am confused what the rule is too. |
it's very easy,why not try it. |
就是每一行,你可以用+-*/什么都可以,放在4个数之间,可以用括号,使结果等于24就行了,不过确实有些小难,我还没有想出来. |