: 1) ;
2) .
3) ;
4) ;
5)
1.
2.
3.
4.
() 1, 3, 6, 8, 5*.
1. .
. 407 , 84, 407 84.
268 320 268 440 . : 2 . . = 2 . ., 6 . . = 6 . ., 8 . = 8 ., 3 . < 4 . , 268 320 < 268 440.
3. 2 7 2, 7. 3, 4, 5, 6. .
5*.
 |
, 4 . , 8 , 4.
6. . .
5 + < 11. (, 1, 2, 3, 4, 5.)
-6<8. (6, 7, 8, 9, 10, 11, 12, 13.)
2 > 13. ( 6.)
4 ∙ + 1 20. (0, 1,2, 3, 4.)
8.
) 22; ) 12; ) 20.
5.
() 2, 4, 7, 9.
2. : 83, 378, 387, 478, 642, 2050, 2705, 3333.
2050 = 2000 + 50
2705 = 2000 + 700+ 5
4.
1000 .
? 3 .
190 .
1) 1000-190 = 810 (.);
2) 810: 3 = 270 (.).
9. (45 + 45: 3) 2 = 120 () = 12 ().
6. () 10, 11.
10.
140: (40 + 30) = 2 (); 40 2 = 80 ();
30 2 = 60 ().
7.
8.
22
. .
: 1) ;
2) .
3) ;
4) ;
5)
1.
2.
3.
4.
() 5*, 6, 1.
1. , .
5*.
 |
, -. , .
, , , . .
6.
I.
= (5 + 9) ∙ 2 = 28 ();
= (5 + 11) ∙ 2 = 32 ();
|
|
|
32 - 28 = 4 ().
II.
2 . , .
, 4 (2 + 2 = 4).
5.
() 3, 2, 4, 7, 8.
2. , , ,
3. , , 8 , 2 3 (23 ). , .
4. :
350 + (350 + 180) = 350 + 530 = 880 ();
350 2 + 180 = 700 + 180 = 880 ().
6. () 9, 10.
9.
 |
: 1920 .
7.
8.
23
. .
: 1) ;
2) .
3) ;
4) ;
5)
1.
2.
3.
4.
() 8*, 4, 5, 6, 11.
4. 20: 4 + 15:5 = 5 + 3 = 8 ().
5.
5 ; 9 .
8*. . . : 1 , 9 (10 -1 = 9). 2 . 9 36 (4 9 = 36). 38 . 28 . . . ..
6, 4.
, . .
6. . : 814 9 = 8140 + 9 = 8149 . , 8149 = 8149. :
2805 < 2806; 1047 = 1047.
5.
() 1, 2, 3, 7, 9, 10.
2.
¼ = 250 , 5 50 = 5050 , 10 = 1 .
9.
15 5 = 75 () ;
= (15 + 75) 2 = 180 () = 18 ().
) 12, 13.
12.
 |
1) 72: 6 = 12 (/); 2) 12 + 15 = 27 (/);
3) 81:27 = 3 ().
7.
8.
24
. . .
: 1) ;
2) ,
3) ;
4)
5)
1.
2.
3.
4.
() 1, 2, 3, 5*.
5*. .
,
2 .
, , 4 .
|
|
|
4 5 .
1. ) 1 , 3
(5-1-1= 3).
) 10 , 1 , 9 .
5.
() 4, 6, 7, 8, 9.
4. .
 |
I. II.
1) 48 5 = 240 (); 1) 490: 5 = 98 ();
2) 490-240 = 250 (); 2) 98 - 48 = 50 ().
3)250: 5 = 50 ().
 | |||
 | |||
7.
, MN, MK, NK, NP, , N,K,P , NP.
8. 84 765 (849 - 84 = 765).
9. (420 - 350) ∙ 3 = 210.
) 10, 11.
10. 840 + 415 + 265 + 72 = 1592 ().
11. 992; 937; 875; 370; 707; 206; 631; 602.
7.
8.
25
