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В первом ящике содержится 20 деталей, из них 15 стандартных; во втором ящике 30 деталей, из них 24 стандартных; в третьем – 10 деталей, из них 6 стандартных. Найти вероятность того, что наудачу извлеченная деталь из наудачу взятого ящика – стандартная.
Подробное решение задачи-
Предмет:
Алгебра -
Автор:
kamrynbowman - 6 лет назад
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Ответы 1
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1 ящик : 15/20 или 3/4 стандартних 2 ящик : 24/30 или 4/5 стандартних 3/4 4/5 15/20. +17/20 = 32/40 или 4/5
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Автор:
meadowwiley - 6 лет назад
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Шахматист играет 15 партий, вероятность выигрыша в каждой равна 0,6. Найти математическое ожидание числа выигранных партий.
Подробное решение -
35 баллов
Помогите пожалуйста с переводом
Juliet: Hey, Maddy! How long am I supposed to gallop around this park? Let's have a break...I'm very tired and cold. Ouch! I'm afraid, I've got a corn on my right foot. Look! It's a blister! Oh, how it hurts...These sneakers are a bit too tight for me.
Madeline: Come on, let's run, Julie, we've just started jogging. Stop whimpering and let's have a good training. Lots of people are jogging along in the park every morning for their health. Look at those girls over there. They are slim, fresh, and pretty, and they feel well...
J.: How do you know that they feel well? Can one feel well after such an exhausting will training? Hardly... If don't stop now, Samuel will be a widower and you'll lose your best friend! "They are slim, fresh and pretty”... They have frail constitution, that's the reason. You were always delicate too, and I was always plump, you know. Therefore, what's the use of torturing myself if I'll never become svelte.
M.: oh yes...you, poor thing! Look at you! You are getting fat, your complexion is sallow, and you cough all the time. I'm sure you will lose you weight if you jog regularly and give up junk food. J.: What do you call "junk food”? A few custard cakes I eat with my coffee or a tiny pizza for dinner from time to time?
M.: Yes, my dear, and dozens of donuts, and your favourite pineapple muffins, and hamburgers with chips, and hotdogs you eat "now and then" during one single day... Besides, I saw your "tiny pizza" it covers the whole kitchen table, and you drink 5 cups of coffee a day. You have to stop eating all this if you want to look and feel well.
J.: Would you like to see me chewing a cabbage leave, and asparagus, like a rabbit, or eating oats all day long, like a horse? What am supposed to eat? No one can live on that "healthy food". I always hated Cornflakes, and those salads, fruit, and vegetables cause nothing but indigestion and hiccups.
M.: You might try to choose the diet that will be good for you. You know, Julie, two years ago I had the same problem. I wasn't careful for my health: I smoked, I ate bacon and eggs, home fries, toast and coffee for breakfast at my favourite coffee shop. For lunch, I stopped the pizza shop for three slices and a large Coke. In the afternoon the ice cream tasted so refreshing...of course, I gained weight. I began to feel tired and sometimes took a nap in the afternoon. I was breathless after climbing the stairs. In addition, there was one more thing, Julie, I looked like a mountain, and I hated myself for my potbelly and sluggishness. So...
J.: So... You consulted your doctor, he put you on a miraculous diet, and you tried it, and now look like a Barby-doll.
M.: Well, actually, I fell in love, Julie... with a very handsome man, my workmate. Certainly, I realised he would never pay attention to such a nondescript figure. At first, I felt depressed. Then I found out that he jogged every morning in the nearest park, and he swam in the local pool twice a week. I started jogging in the same park and joined the local gym. And, of course, I consulted my doctor.
J.: How romantic... You were always strong-willed, Maddy. I mean, you managed to give up eating all those tasty things for the sake of love...
M.: Well, not only for the sake of love, bu also for the sake of my own health, Julie. It was not that easy, you know. I had to change all my habits. First of all, I stopped smoking. Now I eat a light breakfast and take a few apples to work with me. At lunch, I eat a large salad
J.: Oh, yes! I knew that! That irreplaceable salad... M.: Yes, you are right. I like salads now, and I don't eat ice cream anymore. I prefer frozen yoghurt instead. Besides, I play basketball, I roller-skate, and I jog every day. And you can see the result -1'm slim and no longer tired. I feel well; I'm graceful and look younger
J.: Well, Maddy, a very interesting story indeed, but what about the man? Did he finally fall in love with you?
M.: OK, dear. I'll tell you the end of the story after our training... Let's run, come on, Julie, follow me...
J.: That's unfair, Maddy. You've roused my curiosity and no happy end? Hey! Wait for me!...
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Предмет:
Английский язык -
Автор:
brianaixsg - 6 лет назад
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Ответов:
1 -
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