Предмет: Математика, автор: полиночка52

Помогите пожалуйста дам 20 Баллов

К двухзначному числу приписали цифру 5. сначала слева потом справа получили два 3значных числа сумма которых равна 912 найдите двухзначное число

Ответы

Автор ответа: PrЯnicheg
0
Допустим, двузначное число записывается как ху, тогда первое 3-значное число 5ху, второе - ху5.
По условию 5ху+ху5 =912
Если столбиком, то :
+5ху
   ху5
   -----
   912
=> у=7 5х7+х75=912, значит х=3.
Проверяем 537+375=912, значит двузначное число это 37
Ответ: 37
Похожие вопросы
Предмет: Английский язык, автор: pretix1
nfinitive
Full or bare infinitive
PEG 246
Insert to where necessary before the infinitives in brackets.
1 He made me (do) it all over again.
2 She can (sing) quite well.
3 He will be able (swim) very soon.
4 I used (live) in a caravan.
5 You ought (go) today. It may (rain) tomorrow.
6 You needn't (say) anything. Just nod your head and he will (understand).
7 I want (see) the house where our president was born.
8 He made her (repeat) the message.
9 May I (use) your phone?
10 You needn't (ask) for permission; you can (use) it whenever you like.
11 If you want (get) there before dark you should (start) at once.
12 I couldn't (remember) his address.
13 You'll be able (do) it yourself when you are older.
14 Would you like (go) now or shall we (wait) till the end?
15 They won't let us (leave) the Customs shed till our luggage has been examined.
16 How dare you (open) my letters!
17 He didn't dare (argue) with his boss.
18 I used (smoke) forty cigarettes a day.
19 Will you help me (move) the bookcase?
20 He wouldn't let my baby (play) with his gold watch.
21 They refused (accept) the bribe.
22 He is expected (arrive) in a few days.
23 Please let me (know) your decision as soon as possible.
24 He made us (wait) for hours.
25 Could you (tell) me the time, please?
26 We must (send) him a telegram.
27 I let him (go) early as he wanted (meet) his wife.
28 Where would you like (have) lunch?
29 You can (leave) your dog with us if you don't (want) (take) him with you.
30 I'd like him (go) to a university but I can't (make) him (go).
31 We could (go) to a concert, unless you'd prefer (visit) a museum.
32 You seem (know) this area very well. ~
Yes, I used (live) here.
33 The kidnappers told the parents (not inform) the police, and the parents didn't dare
(disobey).
34 Need I (come)? I'd much rather (stay) at home.
35 You can (take) a horse to water but you can't (make) him (drink). (proverb)
36 I'm sorry (disappoint) you but I can't (let) you (have) any more money till the end of
the month.
п.с очень надо