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Проценты. УСТНЫЙ СЧЕТ. Вычислите:. 7 5. 7 ,5. 25 · 3 = 2,5 · 3 = 0,25 · 3 = 25 · 0 ,3 = 2,5 · 0 ,3 = 2,5 · 0,03 = 0,25 · 0 , 3 = 0,25 · 0 ,0 3 =. 0,75. 7 ,5. 0,75. 0,075. 0,075. 0,0075. Вычислите:. 1,247. 12,47 · 0,1 =

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6439448

.


6439448

.


6439448

:

75

7,5

25 3 =

2,5 3 =

0,25 3 =

25 0 ,3 =

2,5 0 ,3 =

2,5 0,03 =

0,25 0 , 3 =

0,25 0 ,0 3 =

0,75

7,5

0,75

0,075

0,075

0,0075


6439448

:

1,247

12,47 0,1=

12,47 : 10 = 12,47 0,001=

12,47 0,01=

12,47 : 100=

1,247

0,01247

0,1247

0,1247


6439448

:

89 .

89 .

70 .

70 .

69 .

69 .

51 , .

51 , .


6439448

1 2

1 3

1 4

1 100

-

-

-

1 %

pro centum (: )


6439448

1% , 100%.


6439448

, 100.

, 100.

0,45 = 0,45 100% = 45%

32% = 32 : 100 = 0,32

= 3 : 5 = 0,6 = 60%


6439448

1. 1200 . 32% . ?

1200 . 100%

? . 32%

:

1) 1200 : 100 = 12 (.) 1%

2) 12 32 = 384 (.) 32%

: 384 .


6439448

2. 5 12 , 30% . ?

12 . 30%

? . 100%

:

1) 12 : 30 = 0,4 1%

2) 0,4 100 = 40 (.)

: 40 .


6439448

:

:

1. :

2. ,

) 1 % 5

) 1 % 300

300 : 100 = 3

5 100 = 500

) 7 % 2100

) 5 % 35

2100 : 100 7 = 147

35 : 5 100 = 700

) 38 % 200

) 25% 10

200 : 100 38 = 76

10 : 25 100 = 40

) 125% 80

) 123 % 24,6

80 : 100 125 = 100

24,6 : 123 100 = 20


6439448

:

1

2

1. :

) 1 % 400

) 1 % 200

400 : 100 =4

200 : 100 = 2

) 6 % 2400

) 8 % 2400

2400 : 100 6 = 144

2400 : 100 8 = 192

) 120 % 40

) 130 % 20

40 : 100 120 = 48

20 : 100 130 = 26

2. ,

) 1 % 39

) 1 % 54

39 100 = 3900

54 100 = 5400

) 7 % 42

) 6 % 48

42 : 7 100 = 600

48 : 6 100 = 800

) 4,5 % 0,9

) 3,5 % 0,7

0,9 : 4,5 100 = 20

0,7 : 3,5 100 = 20


6439448

.

1600,

1601


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