Предмет: Математика, автор: Р3е5г8и2н1а

Уменьшите число: а) 60 на 10%; б) 500 на 28%; в) 90 на 50%; г) 125 на 40%

Ответы

Автор ответа: lilimarenchuk
10
1)=59.3
2)=360
3)=45
4)=75


Р3е5г8и2н1а: плыз помогите очень очень надо
lilimarenchuk: тебе решение?
Р3е5г8и2н1а: да
lilimarenchuk: может фото скинуть?
Р3е5г8и2н1а: давай
lilimarenchuk: хотя я напишу лучше)фото не получится
Р3е5г8и2н1а: ок
lilimarenchuk: а)1)60*10=600
2)600:100=6
3)60-6=54
б)1)500*28=14000
2)14000:100=140
3)500-140=360
в)90*50=4500
2)4500:100=45
90-45=45...и так же последнее
Р3е5г8и2н1а: спасибо
lilimarenchuk: не за что
Автор ответа: bazilchik1997
5
если уменьшить на 10%, это значит надо найти 90%(100-10) от 60

60-100%
х-90%

х=60*90/100=54

если уменьшить на 28%, это значит надо найти 72%(100-28) от 500

500-100%
х-72%

х=500*72/100=360

если уменьшить на 50%, это значит надо найти 50% от 90

ну 50% это половина, зн. 45

если уменьшить на 40%, это значит надо найти 60% от 125

125-100%
х-60%

х=125*60/100=75

Р3е5г8и2н1а: а вы мне ещё не поможете?
bazilchik1997: давай)
Р3е5г8и2н1а: Что больше : а) 45% от 72 или 72% от 45; б) 38% от 80 или 60% от 45.
Р3е5г8и2н1а: поможете?
bazilchik1997: а)72-100% х-45% х=72*45/100=32,4 45-100% у-72% у=45*72/100=33,75 32,4 <33,75, значит 72% от 45 больше
bazilchik1997: б)80-100% х-38% х=80*38/100=30,4 45-100% у-60% у=45*60/100=27 30,4 больше ( значек не пишет :с) 27, значит 38% от 80 больше
bazilchik1997: и в а) 32,4 меньше 33,75
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Noise is a given in our everyday lives. From the moment the alarm clock buzzes or the garbage trucks rouse us, to the time we fall asleep despite the neighbor’s stereo, we accommodate noisy instructions.
(4) Studies suggest that we pay a price for adapting to noise: higher blood pressure, heart rate, and adrenaline secretion- even after the noise stops; heightened aggression; impaired resistance to disease; a sense of helplessness. In terms of stress, unpredictability is an important factor. Studies suggest that when we can control noise, its effects are much less damaging.
Although there are no studies on the effects of quiet in repairing the stress of noise, those who have studied the physiological effects of noise believe that quiet provides an escape. Most people who work in a busy and fairly noisy environment love quiet and need it desperately.
We are so acclimated to noise that complete quiet is sometimes (14) unsettling. You might have trouble sleeping on vacation in the mountains, for example, without the background sounds of traffic. But making the effort to find quiet gives us a chance to hear ourselves think, to become attuned to the world around us, to find peacefulness and calm. (17) It provides a serene antidote to the intrusively loud world we live in the rest of the day.

1.. This passage mainly discusses
( A) life in the city
(B) the effect of noise in our lives
(C)diseases related to stress
(D) why quiet is hard to find
2. We can infer from the passage that the author is writing for which group of people?
(A) People who live in the country
(B) Vacationers
(C) City-dvellers
(D) Doctors
3. What is the author’s attitude toward the noise in the passage?
(A) Humorous
(B) Critical
(C) Emotional
(D) Indifferent
4. According to the passage, noise causes all of the following EXCEPT
(A) oversleeping
(B) stress
(C) higher blood pressure
(D) heightened aggression
5. The author indicates in the passage that stress from noise occurs mainly
(A) in the morning
(B) when we can’t control it
(C) in the mountains
(D) from traffic
6. The phrase “pay a price for” in line 4 could best be replaced by which of the following?
(A) suffer from
(B) lose money because of
(C) work hard
(D) indulge in
7. The word “unsettling” in line 14 could best be replaced by which of the following?
(A) rewarding
(B) necessary
(C) unavoidable
(D) disturbing
8. The word “it” in line 17 refers to
(A) peacefulness and calm
(B) the world around us
(C) quiet
(D) thinking
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