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8 (4 + 3) = 56 (.) 8 4 + 8 3 = 56 (.)
³. 56 . ³. 56 .
, ' 8 4 3. 8 4 3. ³ : 56 .
, 8 (4 + 3) = 8 4 + 8 ■ 3, .
5 ■ (3 + 6).
: :
5 (3, + 6) = 5 9 = 45 5 (3 + 6) = 5 3 + 5 6 = 45
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■ 24 /\ 20 | ||
20 = | = 60 | |
4 = | = 12 | |
+ 12 | = 72 |
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1000, , . ' ■ . -186 VIII. 101-1000. 䳿 1000
: 70 8; 420: 6; 320 3. .
70 8 = 560
7 . 8 = 56 .
420: 6 = 70
42 .: 6 = 7 .
1. ?
2. ?
320 3 : 320 ■ 3 = (300 + 20) 3 = 300 3 + 20 3 = 900 + 60 = 960 "ij ". ' .
. 18 12 . ? '■
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2. ?
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1) 18+ 12 = 30 (.); 1)18:3 = 6 (.);
2) 30: 3 = 10 (.). 2) 12: 3 = 4 (.);
3) 6 + 4 = 10 (.).
' :
(18 + 12): 3 = 10; 18: 3 + 12: 3 = 10.
. ' , 18 12 3. 18 12 3, . ³ .
(18+ 12): 3 == 18:3+ 12: 3.
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"ij ". . : 39: 3; 72: 3; 50: 2.
, :
72: 3 = 50: 2 =
= (60 + 12): 3 = = (40 + 10): 2 =
= 60: 3 + 12: 3 = = 40: 2 + 10: 2 =
= 20 + = 24...■ = 20 + 5 = 25
39: 3- =
= (30 + 9): 3 = = 30: 3 + 9: 3 = = + 3= 13
39 . "" , , . ( , ).
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"ij 72: 3, 50: 2. 䳿, ' ".
I. .
' .
II. . .
24-4 42 + 30 51-9 4-16 8 + 9
72-48 96 + 3 32: 8 17-3 64: 8
III. .
1. .
1) : 64: 2; 48: 4; 99: 3. .
2) 48: 4, :
48: 4 = (40 + 8): 4 = 10 + 2 = 12; 48: 4 = (20 + 28): 4 = 5 + 7 = 12; 48: 4 = (24 + 24): 4 = 6 + 6 = 12.
, (), .
2. . .
72:3 | = | |||
= (60 | + 12): 3 = | |||
= 60: | 2+ 12: 3 = | |||
= 20- | 1-4 = 24 | |||
50:2 = | ||||
= (40 + | ) | :2 = | ||
= 40 + | + | 10:2 = | ||
= 20 + | = | |||
. , ij , . 3. .
1) .
60: 5 = (50 + 10): 5 =... 80: 3 = (60 + 21): 3 =...
2) . 60: 4 96: 4 51: 3 90: 5
IV. . 1. ' .
32 , 2 , 6 , . ? 188
VIII. 101-1000. 䳿 1000
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2. .
1) (9 + 15): 3 ' . ' , .
2) , 5 , + . {³, ( + ) ■ 5).
3. (, ).
56: 4 60 - 50: 5 80: 2: 2 800-150-3
42: 3 100 - 80: 4 90: 3: 5 360 + 40: 4
V. ϳ.
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. .
360: 8 =
36 .: 3 = 12 .
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' ' (. 25):
25
ij | ij | ||
8 ■ 3 = 24 | |||
300 2 = 600 |
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4- 64: 16 = []
16 2 = 32 ( 2 ), 16 3 = 48 ( 3 ), 16-4 = 64 (, 64: 16 = 4).
2, 3 4. 4 .
ϳ ' 2. : , . , 90: 15. 4, 2 3 .
(125: 25; 105: 15; 128: 16).
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ij . . , , , . ( ). г , , . , 35 4 . 35 , 4, 32. 32 4, 8. 8 . 35 32, 3.
2 . , .
6 . 7 . .
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: 14 . , : 4 , 2 .
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. 20 6 . 20 6. 2 (. 108).
. 108 190
VIII. 101-1000. 䳿 1000
. :
20: 6 = 3 (. 2).
20 , 6 , 3 2 .
: 20 6, 3 2.
: 13: 3; 17: 3; 15: 6, . 109.
. 109
"" .
12:3 = 4 16:4 = 4 10:5 = 2
13:3 = 4(. 1) 18: 4 = 4 (. 2) 13: 5 = 2 (. 3) . , . . : 13 12 1, 1; 18 16 2, 2; 13 10 , 3.
1 . : 27: 3 28: 3; 15: 5 17: 5; 36: 4 38: 4. ϳ , , . , , . 1 , . , 5 4, : 1, 2, 3 4. :
4 = 3 16
4 = 3 (. 1) 17
4 = 3 (. 2) 18
4 = 3 (. 3) 19
12 13 14 15
8:4 = 2
9:4 = 2 (. 1)
10: 4 = 2 (. 2)
11:4 = 2 (. 3)
' , , . . , 31: 7 = 4 (. 3). : 7-4 = 28,28 + 3 = 31.
4 = 4
4 = 4 (. 1) 4 = 4 (. 2) 4 = 4 (. 3)