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ДАЮ 100 БАЛЛОВ
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Answer 1

Ответ:

Пошаговое объяснение:

2.

289/(24 -49/(17 -45/(x+1 1/2)))=17

24 -49/(17 -45/(x+1 1/2))=289/17

49/(17 -45/(x+1 1/2))=24-17

17 -45/(x+1 1/2)=49/7

45/(x+1 1/2)=17-7

x+1 1/2=45/10

x=4,5-1,5=3

4.

1450/(1 +56/(8 -54/(6 +12/(1450-x))))=50

1 +56/(8 -54/(6 +12/(1450-x)))=1450/50

56/(8 -54/(6 +12/(1450-x)))=29-1

8 -54/(6 +12/(1450-x))=56/28

54/(6 +12/(1450-x))=8-2

6 +12/(1450-x)=54/6

12/(1450-x)=9-6

1450-x=12/3

x=1450-4=1446

6.

120/(15 -66/(4 +30/(7 +56/(15-x))))=30

15 -66/(4 +30/(7 +56/(15-x)))=120/30

66/(4 +30/(7 +56/(15-x)))=15-4

4 +30/(7 +56/(15-x))=66/11

30/(7 +56/(15-x))=6-4

7 +56/(15-x)=30/2

56/(15-x)=15-7

15-x=56/8

x=15-7=8

8.

16 -(26 -(500 -(1630 -(2x+42)/3)/4)/20)/3=9

(26 -(500 -(1630 -(2x+42)/3)/4)/20)/3=16-9

26 -(500 -(1630 -(2x+42)/3)/4)/20=7·3

(500 -(1630 -(2x+42)/3)/4)/20=26-21

500 -(1630 -(2x+42)/3)/4=5·20

(1630 -(2x+42)/3)/4=500-100

1630 -(2x+42)/3=400·4

(2x+42)/3=1630-1600

2(x+21)=30·3

x+21=90/2

x=45-21=24

10.

19 -75/(10 -45/(10 -8/(19 -121/(14 -78/(25 +49/x)))))=4

75/(10 -45/(10 -8/(19 -121/(14 -78/(25 +49/x)))))=19-4

10 -45/(10 -8/(19 -121/(14 -78/(25 +49/x))))=75/15

45/(10 -8/(19 -121/(14 -78/(25 +49/x))))=10-5

10 -8/(19 -121/(14 -78/(25 +49/x)))=45/5

8/(19 -121/(14 -78/(25 +49/x)))=10-9

19 -121/(14 -78/(25 +49/x))=8/1

121/(14 -78/(25 +49/x))=19-8

14 -78/(25 +49/x)=121/11

78/(25 +49/x)=14-11

25 +49/x=78/3

49/x=26-25

x=49/1=49

12.

200/(49 +3·(170/(89 -158/(4 -84/(3x)))))=2

49 +3·(170/(89 -158/(4 -84/(3x))))=200/2

3·(170/(89 -158/(4 -84/(3x))))=100-49

170/(89 -158/(4 -84/(3x)))=51/3

89 -158/(4 -84/(3x))=170/17

158/(4 -84/(3x))=89-10

4 -84/(3x)=158/79

84/(3x)=4-2

3x=84/2

x=42/3=14