: 1) ;
2) .
3) ;
4) ;
5)
1.
2.
3.
4.
() 1, 4*.
1. , ( 10) :
S = 2 ∙ 5 = 5 ∙ 2 = 10 (2).
.
4*.
2
7 2 7 = 14 ();
86 2 ∙ 86 = 172 ();
9 7 9 = 63 (.);
8 2 63 = 126 ()
14 ∙ 9 = 126 ();
63 ∙ 8 = 504 (.);
2 504 = 1008 ()
126 ∙ 8 = 1008 ().
5.
() 2, 3, 5.
2. S = 9 ∙ 4 = 36 (2); = (9 + 4) 2 = 26 ().
3.
I. II.
1) 994: 7 = 142 (); 994: 7 6 = 852 ().
2) 994-142 = 852 ().
5. , .
600 - ( + 20) = 200
+ 20 = 600 - 200
+ 20 = 400
= 400 - 20
= 380
600 - (380 + 20) = 200
600 - 400 = 200
200 = 200
) 6, 7.
6. (7 ) 840 .
7.
8.
37
. .
: 1)
;
2) .
3) ;
4) ;
5)
1.
2.
3.
4.
() 1, 4*.
1. ?
1)2 + 2 = 2 ∙ 2 = 4 (2)
2) 3 + 3 + 3 = 3 ∙ 3 = 9 (2)
4*.
. . .
 |
P1= 26 () 2 = 24 () 3 = 22 ()
5.
() 2, 3, 5, 6.
2. = 2 (4 + 4) = 16 (),
= 4 4 = 16 ();
S = 4 4 = 16 (2).
, 16, : (16 ), (16 2).
5.
45 4 1) 20: 4 = 5 ()
|
|
|
? 20 2) 45 ∙ 5 = 225 ()
6.
:
) 500- = 50; ) : 100 = 5; ) 400: = 2.
6. () 7, 8.
7. 120: (18 + 22) = 120: 40 = 3 ().
7.
8.
38
. .
: 1) ;
2) .
3) ;
4) ;
5)
1.
2.
3.
4.
() 7, 8, 9, 10.
8. . :
29 * 1 (<, >, =); ?
10 * 3653 ;
3 10 * 102 . .
9.
1 = 1/1000 ; 1 = 1/100 ; 1 = 1/1000 ; 1 = 1/10
10.
124 ∙ = ( = 0) 189 = 189 ( = 1)
+ + = ( = 0) 236 ∙ = 0 ( = 0)
5.
() 1, 2, 5, 3, 6*, 4*.
1. S = b = 11 4 = 44 (2).
2. , .
3.
3 = 60 3 = 180
20 = 60 20 = 1200
100 = 60 100 = 6000
4 20 = 60 4 + 20 = 240 + 20 = 260
9 2 = 60 ∙ 9 + 2 = 540 + 2 = 542
4*. ( 10 ). 25 2 (5 5 = 25). 25 , 4 .
1/25 .
15/25 ,
15 .
10 ,
10 2.
5.
1) 445-335 = 110 ();
2) 110: 2 = 55 () ;
3) 55 + 335 = 390 () .
) 11, 12.
11. 342 .
7.
8.
39
